Add change log for the incompatible changes in MdePkg in Edk r9817.

[mirror_edk2.git] / MdePkg / ChangeLog.txt

diff --git a/MdePkg/ChangeLog.txt b/MdePkg/ChangeLog.txt
index 38f056ca4103a461a9e3d6790af2627d65c63ab5..ab276e8973983b70cee5f4881ce48e5d858b52ac 100644 (file)
--- a/MdePkg/ChangeLog.txt
+++ b/MdePkg/ChangeLog.txt
@@ -326,3 +326,12 @@ Possible impacts:
        This is a source level compatible change, but not binary level. We might need to rebuild some old binary modules to work with newer version of MdePkg.\r
 \r
 \r
+EDK_9815: Non-Compatible: qhuang8\r
+       Scrub EFI_ATA_IDENTIFY_DATA and EFI_ATAPI_IDENTIFY_DATA to strict follow newest ATA spec (ATA-8). This is a build non-backward compatible changes for ATA-related modules.\r
+       The ATA5_IDENTIFY_DATA in MdePkg\IndustryStandards\Atapi.h is exactly the same as the original ATA_IDENTIFY_DATA for backward compatibility support to follow ATA-5 spec. \r
+\r
+Possible impacts:\r
+       We can fix the build breaks for some renaming issues (e.g. Word 49 in EFI_ATA_IDENTIFY_DATA renamed from "capabilities" to "capabilities_49")\r
+       For the fields that are "obsolete" in newest ATA spec, we can use type-cast to older ATA spec structure (e.g. ATA5_IDENTIFY_DATA). \r
+       (There  should not be any runtime issues if the build issues have got solved in the source correctly.)\r
+\r