1 /** @file NorFlashDxe.c
3 Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
15 #include <Library/UefiLib.h>
16 #include <Library/BaseMemoryLib.h>
17 #include <Library/MemoryAllocationLib.h>
18 #include <Library/UefiBootServicesTableLib.h>
19 #include <Library/PcdLib.h>
21 #include "NorFlashDxe.h"
23 STATIC EFI_EVENT mNorFlashVirtualAddrChangeEvent
;
26 // Global variable declarations
28 NOR_FLASH_INSTANCE
**mNorFlashInstances
;
29 UINT32 mNorFlashDeviceCount
;
31 NOR_FLASH_INSTANCE mNorFlashInstanceTemplate
= {
32 NOR_FLASH_SIGNATURE
, // Signature
33 NULL
, // Handle ... NEED TO BE FILLED
35 0, // DeviceBaseAddress ... NEED TO BE FILLED
36 0, // RegionBaseAddress ... NEED TO BE FILLED
37 0, // Size ... NEED TO BE FILLED
41 EFI_BLOCK_IO_PROTOCOL_REVISION2
, // Revision
42 NULL
, // Media ... NEED TO BE FILLED
43 NorFlashBlockIoReset
, // Reset;
44 NorFlashBlockIoReadBlocks
, // ReadBlocks
45 NorFlashBlockIoWriteBlocks
, // WriteBlocks
46 NorFlashBlockIoFlushBlocks
// FlushBlocks
50 0, // MediaId ... NEED TO BE FILLED
51 FALSE
, // RemovableMedia
53 FALSE
, // LogicalPartition
55 FALSE
, // WriteCaching;
56 0, // BlockSize ... NEED TO BE FILLED
58 0, // LastBlock ... NEED TO BE FILLED
59 0, // LowestAlignedLba
60 1, // LogicalBlocksPerPhysicalBlock
64 EFI_DISK_IO_PROTOCOL_REVISION
, // Revision
65 NorFlashDiskIoReadDisk
, // ReadDisk
66 NorFlashDiskIoWriteDisk
// WriteDisk
70 FvbGetAttributes
, // GetAttributes
71 FvbSetAttributes
, // SetAttributes
72 FvbGetPhysicalAddress
, // GetPhysicalAddress
73 FvbGetBlockSize
, // GetBlockSize
76 FvbEraseBlocks
, // EraseBlocks
85 { (UINT8
)sizeof(VENDOR_DEVICE_PATH
), (UINT8
)((sizeof(VENDOR_DEVICE_PATH
)) >> 8) }
87 { 0x0, 0x0, 0x0, { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } }, // GUID ... NEED TO BE FILLED
91 END_ENTIRE_DEVICE_PATH_SUBTYPE
,
92 { sizeof (EFI_DEVICE_PATH_PROTOCOL
), 0 }
98 NorFlashCreateInstance (
99 IN UINTN NorFlashDeviceBase
,
100 IN UINTN NorFlashRegionBase
,
101 IN UINTN NorFlashSize
,
104 IN BOOLEAN SupportFvb
,
105 IN CONST GUID
*NorFlashGuid
,
106 OUT NOR_FLASH_INSTANCE
** NorFlashInstance
110 NOR_FLASH_INSTANCE
* Instance
;
112 ASSERT(NorFlashInstance
!= NULL
);
114 Instance
= AllocateRuntimeCopyPool (sizeof(NOR_FLASH_INSTANCE
),&mNorFlashInstanceTemplate
);
115 if (Instance
== NULL
) {
116 return EFI_OUT_OF_RESOURCES
;
119 Instance
->DeviceBaseAddress
= NorFlashDeviceBase
;
120 Instance
->RegionBaseAddress
= NorFlashRegionBase
;
121 Instance
->Size
= NorFlashSize
;
123 Instance
->BlockIoProtocol
.Media
= &Instance
->Media
;
124 Instance
->Media
.MediaId
= MediaId
;
125 Instance
->Media
.BlockSize
= BlockSize
;
126 Instance
->Media
.LastBlock
= (NorFlashSize
/ BlockSize
)-1;
128 CopyGuid (&Instance
->DevicePath
.Vendor
.Guid
, NorFlashGuid
);
130 Instance
->ShadowBuffer
= AllocateRuntimePool (BlockSize
);;
131 if (Instance
->ShadowBuffer
== NULL
) {
132 return EFI_OUT_OF_RESOURCES
;
136 NorFlashFvbInitialize (Instance
);
138 Status
= gBS
->InstallMultipleProtocolInterfaces (
140 &gEfiDevicePathProtocolGuid
, &Instance
->DevicePath
,
141 &gEfiBlockIoProtocolGuid
, &Instance
->BlockIoProtocol
,
142 &gEfiFirmwareVolumeBlockProtocolGuid
, &Instance
->FvbProtocol
,
145 if (EFI_ERROR(Status
)) {
150 Status
= gBS
->InstallMultipleProtocolInterfaces (
152 &gEfiDevicePathProtocolGuid
, &Instance
->DevicePath
,
153 &gEfiBlockIoProtocolGuid
, &Instance
->BlockIoProtocol
,
154 &gEfiDiskIoProtocolGuid
, &Instance
->DiskIoProtocol
,
157 if (EFI_ERROR(Status
)) {
163 *NorFlashInstance
= Instance
;
168 NorFlashReadStatusRegister (
169 IN NOR_FLASH_INSTANCE
*Instance
,
173 // Prepare to read the status register
174 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_STATUS_REGISTER
);
175 return MmioRead32 (Instance
->DeviceBaseAddress
);
180 NorFlashBlockIsLocked (
181 IN NOR_FLASH_INSTANCE
*Instance
,
182 IN UINTN BlockAddress
187 // Send command for reading device id
188 SEND_NOR_COMMAND (BlockAddress
, 2, P30_CMD_READ_DEVICE_ID
);
190 // Read block lock status
191 LockStatus
= MmioRead32 (CREATE_NOR_ADDRESS(BlockAddress
, 2));
193 // Decode block lock status
194 LockStatus
= FOLD_32BIT_INTO_16BIT(LockStatus
);
196 if ((LockStatus
& 0x2) != 0) {
197 DEBUG((EFI_D_ERROR
, "NorFlashBlockIsLocked: WARNING: Block LOCKED DOWN\n"));
200 return ((LockStatus
& 0x1) != 0);
205 NorFlashUnlockSingleBlock (
206 IN NOR_FLASH_INSTANCE
*Instance
,
207 IN UINTN BlockAddress
212 // Raise the Task Priority Level to TPL_NOTIFY to serialise all its operations
213 // and to protect shared data structures.
215 if (FeaturePcdGet (PcdNorFlashCheckBlockLocked
) == TRUE
) {
217 // Request a lock setup
218 SEND_NOR_COMMAND (BlockAddress
, 0, P30_CMD_LOCK_BLOCK_SETUP
);
221 SEND_NOR_COMMAND (BlockAddress
, 0, P30_CMD_UNLOCK_BLOCK
);
223 // Send command for reading device id
224 SEND_NOR_COMMAND (BlockAddress
, 2, P30_CMD_READ_DEVICE_ID
);
226 // Read block lock status
227 LockStatus
= MmioRead32 (CREATE_NOR_ADDRESS(BlockAddress
, 2));
229 // Decode block lock status
230 LockStatus
= FOLD_32BIT_INTO_16BIT(LockStatus
);
231 } while ((LockStatus
& 0x1) == 1);
233 // Request a lock setup
234 SEND_NOR_COMMAND (BlockAddress
, 0, P30_CMD_LOCK_BLOCK_SETUP
);
237 SEND_NOR_COMMAND (BlockAddress
, 0, P30_CMD_UNLOCK_BLOCK
);
239 // Wait until the status register gives us the all clear
241 LockStatus
= NorFlashReadStatusRegister (Instance
, BlockAddress
);
242 } while ((LockStatus
& P30_SR_BIT_WRITE
) != P30_SR_BIT_WRITE
);
245 // Put device back into Read Array mode
246 SEND_NOR_COMMAND (BlockAddress
, 0, P30_CMD_READ_ARRAY
);
248 DEBUG((DEBUG_BLKIO
, "UnlockSingleBlock: BlockAddress=0x%08x\n", BlockAddress
));
255 NorFlashUnlockSingleBlockIfNecessary (
256 IN NOR_FLASH_INSTANCE
*Instance
,
257 IN UINTN BlockAddress
262 Status
= EFI_SUCCESS
;
264 if (NorFlashBlockIsLocked (Instance
, BlockAddress
) == TRUE
) {
265 Status
= NorFlashUnlockSingleBlock (Instance
, BlockAddress
);
273 * The following function presumes that the block has already been unlocked.
277 NorFlashEraseSingleBlock (
278 IN NOR_FLASH_INSTANCE
*Instance
,
279 IN UINTN BlockAddress
283 UINT32 StatusRegister
;
285 Status
= EFI_SUCCESS
;
287 // Request a block erase and then confirm it
288 SEND_NOR_COMMAND(BlockAddress
, 0, P30_CMD_BLOCK_ERASE_SETUP
);
289 SEND_NOR_COMMAND(BlockAddress
, 0, P30_CMD_BLOCK_ERASE_CONFIRM
);
291 // Wait until the status register gives us the all clear
293 StatusRegister
= NorFlashReadStatusRegister (Instance
, BlockAddress
);
294 } while ((StatusRegister
& P30_SR_BIT_WRITE
) != P30_SR_BIT_WRITE
);
296 if (StatusRegister
& P30_SR_BIT_VPP
) {
297 DEBUG((EFI_D_ERROR
,"EraseSingleBlock(BlockAddress=0x%08x: VPP Range Error\n", BlockAddress
));
298 Status
= EFI_DEVICE_ERROR
;
301 if ((StatusRegister
& (P30_SR_BIT_ERASE
| P30_SR_BIT_PROGRAM
)) == (P30_SR_BIT_ERASE
| P30_SR_BIT_PROGRAM
)) {
302 DEBUG((EFI_D_ERROR
,"EraseSingleBlock(BlockAddress=0x%08x: Command Sequence Error\n", BlockAddress
));
303 Status
= EFI_DEVICE_ERROR
;
306 if (StatusRegister
& P30_SR_BIT_ERASE
) {
307 DEBUG((EFI_D_ERROR
,"EraseSingleBlock(BlockAddress=0x%08x: Block Erase Error StatusRegister:0x%X\n", BlockAddress
, StatusRegister
));
308 Status
= EFI_DEVICE_ERROR
;
311 if (StatusRegister
& P30_SR_BIT_BLOCK_LOCKED
) {
312 // The debug level message has been reduced because a device lock might happen. In this case we just retry it ...
313 DEBUG((EFI_D_INFO
,"EraseSingleBlock(BlockAddress=0x%08x: Block Locked Error\n", BlockAddress
));
314 Status
= EFI_WRITE_PROTECTED
;
317 if (EFI_ERROR(Status
)) {
318 // Clear the Status Register
319 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_CLEAR_STATUS_REGISTER
);
322 // Put device back into Read Array mode
323 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_ARRAY
);
329 * This function unlock and erase an entire NOR Flash block.
332 NorFlashUnlockAndEraseSingleBlock (
333 IN NOR_FLASH_INSTANCE
*Instance
,
334 IN UINTN BlockAddress
341 if (!EfiAtRuntime ()) {
342 // Raise TPL to TPL_HIGH to stop anyone from interrupting us.
343 OriginalTPL
= gBS
->RaiseTPL (TPL_HIGH_LEVEL
);
345 // This initialization is only to prevent the compiler to complain about the
346 // use of uninitialized variables
347 OriginalTPL
= TPL_HIGH_LEVEL
;
351 // The block erase might fail a first time (SW bug ?). Retry it ...
353 // Unlock the block if we have to
354 Status
= NorFlashUnlockSingleBlockIfNecessary (Instance
, BlockAddress
);
355 if (EFI_ERROR (Status
)) {
358 Status
= NorFlashEraseSingleBlock (Instance
, BlockAddress
);
360 } while ((Index
< NOR_FLASH_ERASE_RETRY
) && (Status
== EFI_WRITE_PROTECTED
));
362 if (Index
== NOR_FLASH_ERASE_RETRY
) {
363 DEBUG((EFI_D_ERROR
,"EraseSingleBlock(BlockAddress=0x%08x: Block Locked Error (try to erase %d times)\n", BlockAddress
,Index
));
366 if (!EfiAtRuntime ()) {
367 // Interruptions can resume.
368 gBS
->RestoreTPL (OriginalTPL
);
377 NorFlashWriteSingleWord (
378 IN NOR_FLASH_INSTANCE
*Instance
,
379 IN UINTN WordAddress
,
384 UINT32 StatusRegister
;
386 Status
= EFI_SUCCESS
;
388 // Request a write single word command
389 SEND_NOR_COMMAND(WordAddress
, 0, P30_CMD_WORD_PROGRAM_SETUP
);
391 // Store the word into NOR Flash;
392 MmioWrite32 (WordAddress
, WriteData
);
394 // Wait for the write to complete and then check for any errors; i.e. check the Status Register
396 // Prepare to read the status register
397 StatusRegister
= NorFlashReadStatusRegister (Instance
, WordAddress
);
398 // The chip is busy while the WRITE bit is not asserted
399 } while ((StatusRegister
& P30_SR_BIT_WRITE
) != P30_SR_BIT_WRITE
);
402 // Perform a full status check:
403 // Mask the relevant bits of Status Register.
404 // Everything should be zero, if not, we have a problem
406 if (StatusRegister
& P30_SR_BIT_VPP
) {
407 DEBUG((EFI_D_ERROR
,"NorFlashWriteSingleWord(WordAddress:0x%X): VPP Range Error\n",WordAddress
));
408 Status
= EFI_DEVICE_ERROR
;
411 if (StatusRegister
& P30_SR_BIT_PROGRAM
) {
412 DEBUG((EFI_D_ERROR
,"NorFlashWriteSingleWord(WordAddress:0x%X): Program Error\n",WordAddress
));
413 Status
= EFI_DEVICE_ERROR
;
416 if (StatusRegister
& P30_SR_BIT_BLOCK_LOCKED
) {
417 DEBUG((EFI_D_ERROR
,"NorFlashWriteSingleWord(WordAddress:0x%X): Device Protect Error\n",WordAddress
));
418 Status
= EFI_DEVICE_ERROR
;
421 if (!EFI_ERROR(Status
)) {
422 // Clear the Status Register
423 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_CLEAR_STATUS_REGISTER
);
426 // Put device back into Read Array mode
427 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_ARRAY
);
433 * Writes data to the NOR Flash using the Buffered Programming method.
435 * The maximum size of the on-chip buffer is 32-words, because of hardware restrictions.
436 * Therefore this function will only handle buffers up to 32 words or 128 bytes.
437 * To deal with larger buffers, call this function again.
439 * This function presumes that both the TargetAddress and the TargetAddress+BufferSize
440 * exist entirely within the NOR Flash. Therefore these conditions will not be checked here.
442 * In buffered programming, if the target address not at the beginning of a 32-bit word boundary,
443 * then programming time is doubled and power consumption is increased.
444 * Therefore, it is a requirement to align buffer writes to 32-bit word boundaries.
445 * i.e. the last 4 bits of the target start address must be zero: 0x......00
448 NorFlashWriteBuffer (
449 IN NOR_FLASH_INSTANCE
*Instance
,
450 IN UINTN TargetAddress
,
451 IN UINTN BufferSizeInBytes
,
456 UINTN BufferSizeInWords
;
458 volatile UINT32
*Data
;
460 BOOLEAN BufferAvailable
;
461 UINT32 StatusRegister
;
463 WaitForBuffer
= MAX_BUFFERED_PROG_ITERATIONS
;
464 BufferAvailable
= FALSE
;
466 // Check that the target address does not cross a 32-word boundary.
467 if ((TargetAddress
& BOUNDARY_OF_32_WORDS
) != 0) {
468 return EFI_INVALID_PARAMETER
;
471 // Check there are some data to program
472 if (BufferSizeInBytes
== 0) {
473 return EFI_BUFFER_TOO_SMALL
;
476 // Check that the buffer size does not exceed the maximum hardware buffer size on chip.
477 if (BufferSizeInBytes
> P30_MAX_BUFFER_SIZE_IN_BYTES
) {
478 return EFI_BAD_BUFFER_SIZE
;
481 // Check that the buffer size is a multiple of 32-bit words
482 if ((BufferSizeInBytes
% 4) != 0) {
483 return EFI_BAD_BUFFER_SIZE
;
486 // Pre-programming conditions checked, now start the algorithm.
488 // Prepare the data destination address
489 Data
= (UINT32
*)TargetAddress
;
491 // Check the availability of the buffer
493 // Issue the Buffered Program Setup command
494 SEND_NOR_COMMAND(TargetAddress
, 0, P30_CMD_BUFFERED_PROGRAM_SETUP
);
496 // Read back the status register bit#7 from the same address
497 if (((*Data
) & P30_SR_BIT_WRITE
) == P30_SR_BIT_WRITE
) {
498 BufferAvailable
= TRUE
;
501 // Update the loop counter
504 } while ((WaitForBuffer
> 0) && (BufferAvailable
== FALSE
));
506 // The buffer was not available for writing
507 if (WaitForBuffer
== 0) {
508 Status
= EFI_DEVICE_ERROR
;
512 // From now on we work in 32-bit words
513 BufferSizeInWords
= BufferSizeInBytes
/ (UINTN
)4;
515 // Write the word count, which is (buffer_size_in_words - 1),
516 // because word count 0 means one word.
517 SEND_NOR_COMMAND(TargetAddress
, 0, (BufferSizeInWords
- 1));
519 // Write the data to the NOR Flash, advancing each address by 4 bytes
520 for(Count
=0; Count
< BufferSizeInWords
; Count
++, Data
++, Buffer
++) {
521 MmioWrite32 ((UINTN
)Data
, *Buffer
);
524 // Issue the Buffered Program Confirm command, to start the programming operation
525 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_BUFFERED_PROGRAM_CONFIRM
);
527 // Wait for the write to complete and then check for any errors; i.e. check the Status Register
529 StatusRegister
= NorFlashReadStatusRegister (Instance
, TargetAddress
);
530 // The chip is busy while the WRITE bit is not asserted
531 } while ((StatusRegister
& P30_SR_BIT_WRITE
) != P30_SR_BIT_WRITE
);
534 // Perform a full status check:
535 // Mask the relevant bits of Status Register.
536 // Everything should be zero, if not, we have a problem
538 Status
= EFI_SUCCESS
;
540 if (StatusRegister
& P30_SR_BIT_VPP
) {
541 DEBUG((EFI_D_ERROR
,"NorFlashWriteBuffer(TargetAddress:0x%X): VPP Range Error\n", TargetAddress
));
542 Status
= EFI_DEVICE_ERROR
;
545 if (StatusRegister
& P30_SR_BIT_PROGRAM
) {
546 DEBUG((EFI_D_ERROR
,"NorFlashWriteBuffer(TargetAddress:0x%X): Program Error\n", TargetAddress
));
547 Status
= EFI_DEVICE_ERROR
;
550 if (StatusRegister
& P30_SR_BIT_BLOCK_LOCKED
) {
551 DEBUG((EFI_D_ERROR
,"NorFlashWriteBuffer(TargetAddress:0x%X): Device Protect Error\n",TargetAddress
));
552 Status
= EFI_DEVICE_ERROR
;
555 if (!EFI_ERROR(Status
)) {
556 // Clear the Status Register
557 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_CLEAR_STATUS_REGISTER
);
561 // Put device back into Read Array mode
562 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_ARRAY
);
569 NorFlashWriteFullBlock (
570 IN NOR_FLASH_INSTANCE
*Instance
,
572 IN UINT32
*DataBuffer
,
573 IN UINT32 BlockSizeInWords
581 UINTN BuffersInBlock
;
582 UINTN RemainingWords
;
586 Status
= EFI_SUCCESS
;
588 // Get the physical address of the block
589 BlockAddress
= GET_NOR_BLOCK_ADDRESS (Instance
->RegionBaseAddress
, Lba
, BlockSizeInWords
* 4);
591 // Start writing from the first address at the start of the block
592 WordAddress
= BlockAddress
;
594 if (!EfiAtRuntime ()) {
595 // Raise TPL to TPL_HIGH to stop anyone from interrupting us.
596 OriginalTPL
= gBS
->RaiseTPL (TPL_HIGH_LEVEL
);
598 // This initialization is only to prevent the compiler to complain about the
599 // use of uninitialized variables
600 OriginalTPL
= TPL_HIGH_LEVEL
;
603 Status
= NorFlashUnlockAndEraseSingleBlock (Instance
, BlockAddress
);
604 if (EFI_ERROR(Status
)) {
605 DEBUG((EFI_D_ERROR
, "WriteSingleBlock: ERROR - Failed to Unlock and Erase the single block at 0x%X\n", BlockAddress
));
609 // To speed up the programming operation, NOR Flash is programmed using the Buffered Programming method.
611 // Check that the address starts at a 32-word boundary, i.e. last 7 bits must be zero
612 if ((WordAddress
& BOUNDARY_OF_32_WORDS
) == 0x00) {
614 // First, break the entire block into buffer-sized chunks.
615 BuffersInBlock
= (UINTN
)(BlockSizeInWords
* 4) / P30_MAX_BUFFER_SIZE_IN_BYTES
;
617 // Then feed each buffer chunk to the NOR Flash
618 // If a buffer does not contain any data, don't write it.
620 BufferIndex
< BuffersInBlock
;
621 BufferIndex
++, WordAddress
+= P30_MAX_BUFFER_SIZE_IN_BYTES
, DataBuffer
+= P30_MAX_BUFFER_SIZE_IN_WORDS
623 // Check the buffer to see if it contains any data (not set all 1s).
624 for (Cnt
= 0; Cnt
< P30_MAX_BUFFER_SIZE_IN_WORDS
; Cnt
++) {
625 if (~DataBuffer
[Cnt
] != 0 ) {
626 // Some data found, write the buffer.
627 Status
= NorFlashWriteBuffer (Instance
, WordAddress
, P30_MAX_BUFFER_SIZE_IN_BYTES
,
629 if (EFI_ERROR(Status
)) {
637 // Finally, finish off any remaining words that are less than the maximum size of the buffer
638 RemainingWords
= BlockSizeInWords
% P30_MAX_BUFFER_SIZE_IN_WORDS
;
640 if(RemainingWords
!= 0) {
641 Status
= NorFlashWriteBuffer (Instance
, WordAddress
, (RemainingWords
* 4), DataBuffer
);
642 if (EFI_ERROR(Status
)) {
648 // For now, use the single word programming algorithm
649 // It is unlikely that the NOR Flash will exist in an address which falls within a 32 word boundary range,
650 // i.e. which ends in the range 0x......01 - 0x......7F.
651 for(WordIndex
=0; WordIndex
<BlockSizeInWords
; WordIndex
++, DataBuffer
++, WordAddress
= WordAddress
+ 4) {
652 Status
= NorFlashWriteSingleWord (Instance
, WordAddress
, *DataBuffer
);
653 if (EFI_ERROR(Status
)) {
660 if (!EfiAtRuntime ()) {
661 // Interruptions can resume.
662 gBS
->RestoreTPL (OriginalTPL
);
665 if (EFI_ERROR(Status
)) {
666 DEBUG((EFI_D_ERROR
, "NOR FLASH Programming [WriteSingleBlock] failed at address 0x%08x. Exit Status = \"%r\".\n", WordAddress
, Status
));
673 NorFlashWriteBlocks (
674 IN NOR_FLASH_INSTANCE
*Instance
,
676 IN UINTN BufferSizeInBytes
,
680 UINT32
*pWriteBuffer
;
681 EFI_STATUS Status
= EFI_SUCCESS
;
682 EFI_LBA CurrentBlock
;
683 UINT32 BlockSizeInWords
;
687 // The buffer must be valid
688 if (Buffer
== NULL
) {
689 return EFI_INVALID_PARAMETER
;
692 if(Instance
->Media
.ReadOnly
== TRUE
) {
693 return EFI_WRITE_PROTECTED
;
696 // We must have some bytes to read
697 DEBUG((DEBUG_BLKIO
, "NorFlashWriteBlocks: BufferSizeInBytes=0x%x\n", BufferSizeInBytes
));
698 if(BufferSizeInBytes
== 0) {
699 return EFI_BAD_BUFFER_SIZE
;
702 // The size of the buffer must be a multiple of the block size
703 DEBUG((DEBUG_BLKIO
, "NorFlashWriteBlocks: BlockSize in bytes =0x%x\n", Instance
->Media
.BlockSize
));
704 if ((BufferSizeInBytes
% Instance
->Media
.BlockSize
) != 0) {
705 return EFI_BAD_BUFFER_SIZE
;
708 // All blocks must be within the device
709 NumBlocks
= ((UINT32
)BufferSizeInBytes
) / Instance
->Media
.BlockSize
;
711 DEBUG((DEBUG_BLKIO
, "NorFlashWriteBlocks: NumBlocks=%d, LastBlock=%ld, Lba=%ld.\n", NumBlocks
, Instance
->Media
.LastBlock
, Lba
));
713 if ((Lba
+ NumBlocks
) > (Instance
->Media
.LastBlock
+ 1)) {
714 DEBUG((EFI_D_ERROR
, "NorFlashWriteBlocks: ERROR - Write will exceed last block.\n"));
715 return EFI_INVALID_PARAMETER
;
718 BlockSizeInWords
= Instance
->Media
.BlockSize
/ 4;
720 // Because the target *Buffer is a pointer to VOID, we must put all the data into a pointer
721 // to a proper data type, so use *ReadBuffer
722 pWriteBuffer
= (UINT32
*)Buffer
;
725 for (BlockCount
=0; BlockCount
< NumBlocks
; BlockCount
++, CurrentBlock
++, pWriteBuffer
= pWriteBuffer
+ BlockSizeInWords
) {
727 DEBUG((DEBUG_BLKIO
, "NorFlashWriteBlocks: Writing block #%d\n", (UINTN
)CurrentBlock
));
729 Status
= NorFlashWriteFullBlock (Instance
, CurrentBlock
, pWriteBuffer
, BlockSizeInWords
);
731 if (EFI_ERROR(Status
)) {
736 DEBUG((DEBUG_BLKIO
, "NorFlashWriteBlocks: Exit Status = \"%r\".\n", Status
));
740 #define BOTH_ALIGNED(a, b, align) ((((UINTN)(a) | (UINTN)(b)) & ((align) - 1)) == 0)
743 Copy Length bytes from Source to Destination, using aligned accesses only.
744 Note that this implementation uses memcpy() semantics rather then memmove()
745 semantics, i.e., SourceBuffer and DestinationBuffer should not overlap.
747 @param DestinationBuffer The target of the copy request.
748 @param SourceBuffer The place to copy from.
749 @param Length The number of bytes to copy.
757 OUT VOID
*DestinationBuffer
,
758 IN CONST VOID
*SourceBuffer
,
763 CONST UINT8
*Source8
;
764 UINT32
*Destination32
;
765 CONST UINT32
*Source32
;
766 UINT64
*Destination64
;
767 CONST UINT64
*Source64
;
769 if (BOTH_ALIGNED(DestinationBuffer
, SourceBuffer
, 8) && Length
>= 8) {
770 Destination64
= DestinationBuffer
;
771 Source64
= SourceBuffer
;
772 while (Length
>= 8) {
773 *Destination64
++ = *Source64
++;
777 Destination8
= (UINT8
*)Destination64
;
778 Source8
= (CONST UINT8
*)Source64
;
779 } else if (BOTH_ALIGNED(DestinationBuffer
, SourceBuffer
, 4) && Length
>= 4) {
780 Destination32
= DestinationBuffer
;
781 Source32
= SourceBuffer
;
782 while (Length
>= 4) {
783 *Destination32
++ = *Source32
++;
787 Destination8
= (UINT8
*)Destination32
;
788 Source8
= (CONST UINT8
*)Source32
;
790 Destination8
= DestinationBuffer
;
791 Source8
= SourceBuffer
;
793 while (Length
-- != 0) {
794 *Destination8
++ = *Source8
++;
796 return DestinationBuffer
;
801 IN NOR_FLASH_INSTANCE
*Instance
,
803 IN UINTN BufferSizeInBytes
,
810 DEBUG((DEBUG_BLKIO
, "NorFlashReadBlocks: BufferSize=0x%xB BlockSize=0x%xB LastBlock=%ld, Lba=%ld.\n",
811 BufferSizeInBytes
, Instance
->Media
.BlockSize
, Instance
->Media
.LastBlock
, Lba
));
813 // The buffer must be valid
814 if (Buffer
== NULL
) {
815 return EFI_INVALID_PARAMETER
;
818 // Return if we have not any byte to read
819 if (BufferSizeInBytes
== 0) {
823 // The size of the buffer must be a multiple of the block size
824 if ((BufferSizeInBytes
% Instance
->Media
.BlockSize
) != 0) {
825 return EFI_BAD_BUFFER_SIZE
;
828 // All blocks must be within the device
829 NumBlocks
= ((UINT32
)BufferSizeInBytes
) / Instance
->Media
.BlockSize
;
831 if ((Lba
+ NumBlocks
) > (Instance
->Media
.LastBlock
+ 1)) {
832 DEBUG((EFI_D_ERROR
, "NorFlashReadBlocks: ERROR - Read will exceed last block\n"));
833 return EFI_INVALID_PARAMETER
;
836 // Get the address to start reading from
837 StartAddress
= GET_NOR_BLOCK_ADDRESS (Instance
->RegionBaseAddress
,
839 Instance
->Media
.BlockSize
842 // Put the device into Read Array mode
843 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_ARRAY
);
846 AlignedCopyMem (Buffer
, (VOID
*)StartAddress
, BufferSizeInBytes
);
853 IN NOR_FLASH_INSTANCE
*Instance
,
856 IN UINTN BufferSizeInBytes
,
862 // The buffer must be valid
863 if (Buffer
== NULL
) {
864 return EFI_INVALID_PARAMETER
;
867 // Return if we have not any byte to read
868 if (BufferSizeInBytes
== 0) {
872 if (((Lba
* Instance
->Media
.BlockSize
) + Offset
+ BufferSizeInBytes
) > Instance
->Size
) {
873 DEBUG ((EFI_D_ERROR
, "NorFlashRead: ERROR - Read will exceed device size.\n"));
874 return EFI_INVALID_PARAMETER
;
877 // Get the address to start reading from
878 StartAddress
= GET_NOR_BLOCK_ADDRESS (Instance
->RegionBaseAddress
,
880 Instance
->Media
.BlockSize
883 // Put the device into Read Array mode
884 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_ARRAY
);
887 AlignedCopyMem (Buffer
, (VOID
*)(StartAddress
+ Offset
), BufferSizeInBytes
);
893 Write a full or portion of a block. It must not span block boundaries; that is,
894 Offset + *NumBytes <= Instance->Media.BlockSize.
897 NorFlashWriteSingleBlock (
898 IN NOR_FLASH_INSTANCE
*Instance
,
901 IN OUT UINTN
*NumBytes
,
905 EFI_STATUS TempStatus
;
916 UINTN PrevBlockAddress
;
918 PrevBlockAddress
= 0;
920 DEBUG ((DEBUG_BLKIO
, "NorFlashWriteSingleBlock(Parameters: Lba=%ld, Offset=0x%x, *NumBytes=0x%x, Buffer @ 0x%08x)\n", Lba
, Offset
, *NumBytes
, Buffer
));
922 // Detect WriteDisabled state
923 if (Instance
->Media
.ReadOnly
== TRUE
) {
924 DEBUG ((EFI_D_ERROR
, "NorFlashWriteSingleBlock: ERROR - Can not write: Device is in WriteDisabled state.\n"));
925 // It is in WriteDisabled state, return an error right away
926 return EFI_ACCESS_DENIED
;
929 // Cache the block size to avoid de-referencing pointers all the time
930 BlockSize
= Instance
->Media
.BlockSize
;
932 // The write must not span block boundaries.
933 // We need to check each variable individually because adding two large values together overflows.
934 if ( ( Offset
>= BlockSize
) ||
935 ( *NumBytes
> BlockSize
) ||
936 ( (Offset
+ *NumBytes
) > BlockSize
) ) {
937 DEBUG ((EFI_D_ERROR
, "NorFlashWriteSingleBlock: ERROR - EFI_BAD_BUFFER_SIZE: (Offset=0x%x + NumBytes=0x%x) > BlockSize=0x%x\n", Offset
, *NumBytes
, BlockSize
));
938 return EFI_BAD_BUFFER_SIZE
;
941 // We must have some bytes to write
942 if (*NumBytes
== 0) {
943 DEBUG ((EFI_D_ERROR
, "NorFlashWriteSingleBlock: ERROR - EFI_BAD_BUFFER_SIZE: (Offset=0x%x + NumBytes=0x%x) > BlockSize=0x%x\n", Offset
, *NumBytes
, BlockSize
));
944 return EFI_BAD_BUFFER_SIZE
;
947 // Pick 128bytes as a good start for word operations as opposed to erasing the
948 // block and writing the data regardless if an erase is really needed.
949 // It looks like most individual NV variable writes are smaller than 128bytes.
950 if (*NumBytes
<= 128) {
951 // Check to see if we need to erase before programming the data into NOR.
952 // If the destination bits are only changing from 1s to 0s we can just write.
953 // After a block is erased all bits in the block is set to 1.
954 // If any byte requires us to erase we just give up and rewrite all of it.
956 BytesToWrite
= *NumBytes
;
959 while (BytesToWrite
> 0) {
960 // Read full word from NOR, splice as required. A word is the smallest
961 // unit we can write.
962 TempStatus
= NorFlashRead (Instance
, Lba
, CurOffset
& ~(0x3), sizeof(Tmp
), &Tmp
);
963 if (EFI_ERROR (TempStatus
)) {
964 return EFI_DEVICE_ERROR
;
967 // Physical address of word in NOR to write.
968 WordAddr
= (CurOffset
& ~(0x3)) + GET_NOR_BLOCK_ADDRESS (Instance
->RegionBaseAddress
,
970 // The word of data that is to be written.
971 TmpBuf
= *((UINT32
*)(Buffer
+ (*NumBytes
- BytesToWrite
)));
973 // First do word aligned chunks.
974 if ((CurOffset
& 0x3) == 0) {
975 if (BytesToWrite
>= 4) {
976 // Is the destination still in 'erased' state?
978 // Check to see if we are only changing bits to zero.
979 if ((Tmp
^ TmpBuf
) & TmpBuf
) {
984 // Write this word to NOR
985 WordToWrite
= TmpBuf
;
986 CurOffset
+= sizeof(TmpBuf
);
987 BytesToWrite
-= sizeof(TmpBuf
);
989 // BytesToWrite < 4. Do small writes and left-overs
990 Mask
= ~((~0) << (BytesToWrite
* 8));
991 // Mask out the bytes we want.
993 // Is the destination still in 'erased' state?
994 if ((Tmp
& Mask
) != Mask
) {
995 // Check to see if we are only changing bits to zero.
996 if ((Tmp
^ TmpBuf
) & TmpBuf
) {
1001 // Merge old and new data. Write merged word to NOR
1002 WordToWrite
= (Tmp
& ~Mask
) | TmpBuf
;
1003 CurOffset
+= BytesToWrite
;
1007 // Do multiple words, but starting unaligned.
1008 if (BytesToWrite
> (4 - (CurOffset
& 0x3))) {
1009 Mask
= ((~0) << ((CurOffset
& 0x3) * 8));
1010 // Mask out the bytes we want.
1012 // Is the destination still in 'erased' state?
1013 if ((Tmp
& Mask
) != Mask
) {
1014 // Check to see if we are only changing bits to zero.
1015 if ((Tmp
^ TmpBuf
) & TmpBuf
) {
1020 // Merge old and new data. Write merged word to NOR
1021 WordToWrite
= (Tmp
& ~Mask
) | TmpBuf
;
1022 BytesToWrite
-= (4 - (CurOffset
& 0x3));
1023 CurOffset
+= (4 - (CurOffset
& 0x3));
1025 // Unaligned and fits in one word.
1026 Mask
= (~((~0) << (BytesToWrite
* 8))) << ((CurOffset
& 0x3) * 8);
1027 // Mask out the bytes we want.
1028 TmpBuf
= (TmpBuf
<< ((CurOffset
& 0x3) * 8)) & Mask
;
1029 // Is the destination still in 'erased' state?
1030 if ((Tmp
& Mask
) != Mask
) {
1031 // Check to see if we are only changing bits to zero.
1032 if ((Tmp
^ TmpBuf
) & TmpBuf
) {
1037 // Merge old and new data. Write merged word to NOR
1038 WordToWrite
= (Tmp
& ~Mask
) | TmpBuf
;
1039 CurOffset
+= BytesToWrite
;
1045 // Write the word to NOR.
1048 BlockAddress
= GET_NOR_BLOCK_ADDRESS (Instance
->RegionBaseAddress
, Lba
, BlockSize
);
1049 if (BlockAddress
!= PrevBlockAddress
) {
1050 TempStatus
= NorFlashUnlockSingleBlockIfNecessary (Instance
, BlockAddress
);
1051 if (EFI_ERROR (TempStatus
)) {
1052 return EFI_DEVICE_ERROR
;
1054 PrevBlockAddress
= BlockAddress
;
1056 TempStatus
= NorFlashWriteSingleWord (Instance
, WordAddr
, WordToWrite
);
1057 if (EFI_ERROR (TempStatus
)) {
1058 return EFI_DEVICE_ERROR
;
1061 // Exit if we got here and could write all the data. Otherwise do the
1062 // Erase-Write cycle.
1068 // Check we did get some memory. Buffer is BlockSize.
1069 if (Instance
->ShadowBuffer
== NULL
) {
1070 DEBUG ((EFI_D_ERROR
, "FvbWrite: ERROR - Buffer not ready\n"));
1071 return EFI_DEVICE_ERROR
;
1074 // Read NOR Flash data into shadow buffer
1075 TempStatus
= NorFlashReadBlocks (Instance
, Lba
, BlockSize
, Instance
->ShadowBuffer
);
1076 if (EFI_ERROR (TempStatus
)) {
1077 // Return one of the pre-approved error statuses
1078 return EFI_DEVICE_ERROR
;
1081 // Put the data at the appropriate location inside the buffer area
1082 CopyMem ((VOID
*)((UINTN
)Instance
->ShadowBuffer
+ Offset
), Buffer
, *NumBytes
);
1084 // Write the modified buffer back to the NorFlash
1085 TempStatus
= NorFlashWriteBlocks (Instance
, Lba
, BlockSize
, Instance
->ShadowBuffer
);
1086 if (EFI_ERROR (TempStatus
)) {
1087 // Return one of the pre-approved error statuses
1088 return EFI_DEVICE_ERROR
;
1095 Although DiskIoDxe will automatically install the DiskIO protocol whenever
1096 we install the BlockIO protocol, its implementation is sub-optimal as it reads
1097 and writes entire blocks using the BlockIO protocol. In fact we can access
1098 NOR flash with a finer granularity than that, so we can improve performance
1099 by directly producing the DiskIO protocol.
1103 Read BufferSize bytes from Offset into Buffer.
1105 @param This Protocol instance pointer.
1106 @param MediaId Id of the media, changes every time the media is replaced.
1107 @param Offset The starting byte offset to read from
1108 @param BufferSize Size of Buffer
1109 @param Buffer Buffer containing read data
1111 @retval EFI_SUCCESS The data was read correctly from the device.
1112 @retval EFI_DEVICE_ERROR The device reported an error while performing the read.
1113 @retval EFI_NO_MEDIA There is no media in the device.
1114 @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
1115 @retval EFI_INVALID_PARAMETER The read request contains device addresses that are not
1116 valid for the device.
1121 NorFlashDiskIoReadDisk (
1122 IN EFI_DISK_IO_PROTOCOL
*This
,
1124 IN UINT64 DiskOffset
,
1125 IN UINTN BufferSize
,
1129 NOR_FLASH_INSTANCE
*Instance
;
1134 Instance
= INSTANCE_FROM_DISKIO_THIS(This
);
1136 if (MediaId
!= Instance
->Media
.MediaId
) {
1137 return EFI_MEDIA_CHANGED
;
1140 BlockSize
= Instance
->Media
.BlockSize
;
1141 Lba
= (EFI_LBA
) DivU64x32Remainder (DiskOffset
, BlockSize
, &BlockOffset
);
1143 return NorFlashRead (Instance
, Lba
, BlockOffset
, BufferSize
, Buffer
);
1147 Writes a specified number of bytes to a device.
1149 @param This Indicates a pointer to the calling context.
1150 @param MediaId ID of the medium to be written.
1151 @param Offset The starting byte offset on the logical block I/O device to write.
1152 @param BufferSize The size in bytes of Buffer. The number of bytes to write to the device.
1153 @param Buffer A pointer to the buffer containing the data to be written.
1155 @retval EFI_SUCCESS The data was written correctly to the device.
1156 @retval EFI_WRITE_PROTECTED The device can not be written to.
1157 @retval EFI_DEVICE_ERROR The device reported an error while performing the write.
1158 @retval EFI_NO_MEDIA There is no media in the device.
1159 @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
1160 @retval EFI_INVALID_PARAMETER The write request contains device addresses that are not
1161 valid for the device.
1166 NorFlashDiskIoWriteDisk (
1167 IN EFI_DISK_IO_PROTOCOL
*This
,
1169 IN UINT64 DiskOffset
,
1170 IN UINTN BufferSize
,
1174 NOR_FLASH_INSTANCE
*Instance
;
1178 UINTN RemainingBytes
;
1182 Instance
= INSTANCE_FROM_DISKIO_THIS(This
);
1184 if (MediaId
!= Instance
->Media
.MediaId
) {
1185 return EFI_MEDIA_CHANGED
;
1188 BlockSize
= Instance
->Media
.BlockSize
;
1189 Lba
= (EFI_LBA
) DivU64x32Remainder (DiskOffset
, BlockSize
, &BlockOffset
);
1191 RemainingBytes
= BufferSize
;
1193 // Write either all the remaining bytes, or the number of bytes that bring
1194 // us up to a block boundary, whichever is less.
1195 // (DiskOffset | (BlockSize - 1)) + 1) rounds DiskOffset up to the next
1196 // block boundary (even if it is already on one).
1197 WriteSize
= MIN (RemainingBytes
, ((DiskOffset
| (BlockSize
- 1)) + 1) - DiskOffset
);
1200 if (WriteSize
== BlockSize
) {
1201 // Write a full block
1202 Status
= NorFlashWriteFullBlock (Instance
, Lba
, Buffer
, BlockSize
/ sizeof (UINT32
));
1204 // Write a partial block
1205 Status
= NorFlashWriteSingleBlock (Instance
, Lba
, BlockOffset
, &WriteSize
, Buffer
);
1207 if (EFI_ERROR (Status
)) {
1210 // Now continue writing either all the remaining bytes or single blocks.
1211 RemainingBytes
-= WriteSize
;
1212 Buffer
= (UINT8
*) Buffer
+ WriteSize
;
1215 WriteSize
= MIN (RemainingBytes
, BlockSize
);
1216 } while (RemainingBytes
);
1223 IN NOR_FLASH_INSTANCE
*Instance
1226 // As there is no specific RESET to perform, ensure that the devices is in the default Read Array mode
1227 SEND_NOR_COMMAND (Instance
->DeviceBaseAddress
, 0, P30_CMD_READ_ARRAY
);
1232 Fixup internal data so that EFI can be call in virtual mode.
1233 Call the passed in Child Notify event and convert any pointers in
1234 lib to virtual mode.
1236 @param[in] Event The Event that is being processed
1237 @param[in] Context Event Context
1241 NorFlashVirtualNotifyEvent (
1248 for (Index
= 0; Index
< mNorFlashDeviceCount
; Index
++) {
1249 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->DeviceBaseAddress
);
1250 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->RegionBaseAddress
);
1252 // Convert BlockIo protocol
1253 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->BlockIoProtocol
.FlushBlocks
);
1254 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->BlockIoProtocol
.ReadBlocks
);
1255 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->BlockIoProtocol
.Reset
);
1256 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->BlockIoProtocol
.WriteBlocks
);
1259 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.EraseBlocks
);
1260 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.GetAttributes
);
1261 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.GetBlockSize
);
1262 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.GetPhysicalAddress
);
1263 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.Read
);
1264 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.SetAttributes
);
1265 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->FvbProtocol
.Write
);
1267 if (mNorFlashInstances
[Index
]->ShadowBuffer
!= NULL
) {
1268 EfiConvertPointer (0x0, (VOID
**)&mNorFlashInstances
[Index
]->ShadowBuffer
);
1277 NorFlashInitialise (
1278 IN EFI_HANDLE ImageHandle
,
1279 IN EFI_SYSTEM_TABLE
*SystemTable
1284 NOR_FLASH_DESCRIPTION
* NorFlashDevices
;
1285 BOOLEAN ContainVariableStorage
;
1287 Status
= NorFlashPlatformInitialization ();
1288 if (EFI_ERROR(Status
)) {
1289 DEBUG((EFI_D_ERROR
,"NorFlashInitialise: Fail to initialize Nor Flash devices\n"));
1293 Status
= NorFlashPlatformGetDevices (&NorFlashDevices
, &mNorFlashDeviceCount
);
1294 if (EFI_ERROR(Status
)) {
1295 DEBUG((EFI_D_ERROR
,"NorFlashInitialise: Fail to get Nor Flash devices\n"));
1299 mNorFlashInstances
= AllocateRuntimePool (sizeof(NOR_FLASH_INSTANCE
*) * mNorFlashDeviceCount
);
1301 for (Index
= 0; Index
< mNorFlashDeviceCount
; Index
++) {
1302 // Check if this NOR Flash device contain the variable storage region
1303 ContainVariableStorage
=
1304 (NorFlashDevices
[Index
].RegionBaseAddress
<= PcdGet32 (PcdFlashNvStorageVariableBase
)) &&
1305 (PcdGet32 (PcdFlashNvStorageVariableBase
) + PcdGet32 (PcdFlashNvStorageVariableSize
) <= NorFlashDevices
[Index
].RegionBaseAddress
+ NorFlashDevices
[Index
].Size
);
1307 Status
= NorFlashCreateInstance (
1308 NorFlashDevices
[Index
].DeviceBaseAddress
,
1309 NorFlashDevices
[Index
].RegionBaseAddress
,
1310 NorFlashDevices
[Index
].Size
,
1312 NorFlashDevices
[Index
].BlockSize
,
1313 ContainVariableStorage
,
1314 &NorFlashDevices
[Index
].Guid
,
1315 &mNorFlashInstances
[Index
]
1317 if (EFI_ERROR(Status
)) {
1318 DEBUG((EFI_D_ERROR
,"NorFlashInitialise: Fail to create instance for NorFlash[%d]\n",Index
));
1323 // Register for the virtual address change event
1325 Status
= gBS
->CreateEventEx (
1328 NorFlashVirtualNotifyEvent
,
1330 &gEfiEventVirtualAddressChangeGuid
,
1331 &mNorFlashVirtualAddrChangeEvent
1333 ASSERT_EFI_ERROR (Status
);