OvmfPkg: describe debug messages in the README file

[mirror_edk2.git] / OvmfPkg / README

\r
=== OVMF OVERVIEW ===\r
\r
The Open Virtual Machine Firmware (OVMF) project aims\r
to support firmware for Virtual Machines using the edk2\r
code base.  More information can be found at:\r
\r
http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=OVMF\r
\r
=== STATUS ===\r
\r
Current status: Alpha\r
\r
Current capabilities:\r
* IA32 and X64 architectures\r
* QEMU (0.10.0 or later)\r
  - Video, keyboard, IDE, CD-ROM, serial\r
  - Runs UEFI shell\r
  - Optional NIC support.  Requires QEMU (0.12.2 or later)\r
* UEFI Linux boots\r
* UEFI Windows 8 boots\r
\r
=== FUTURE PLANS ===\r
\r
* Stabilize UEFI Linux boot\r
* Test/Stabilize UEFI Self-Certification Tests (SCT) results\r
\r
=== BUILDING OVMF ===\r
\r
Pre-requisites:\r
* Build environment capable of build the edk2 MdeModulePkg.\r
* A properly configured ASL compiler:\r
  - Intel ASL compiler: Available from http://www.acpica.org\r
  - Microsoft ASL compiler: Available from http://www.acpi.info\r
\r
Update Conf/target.txt ACTIVE_PLATFORM for OVMF:\r
                             PEI arch   DXE arch   UEFI interfaces\r
* OvmfPkg/OvmfPkgIa32.dsc      IA32       IA32           IA32\r
* OvmfPkg/OvmfPkgIa32X64.dsc   IA32       X64            X64\r
* OvmfPkg/OvmfPkgX64.dsc       X64        X64            X64\r
\r
Update Conf/target.txt TARGET_ARCH based on the .dsc file:\r
                             TARGET_ARCH\r
* OvmfPkg/OvmfPkgIa32.dsc     IA32\r
* OvmfPkg/OvmfPkgIa32X64.dsc  IA32 X64\r
* OvmfPkg/OvmfPkgX64.dsc      X64\r
\r
Following the edk2 build process, you will find the OVMF binaries\r
under the $WORKSPACE/Build/*/*/FV directory.  The actual path will\r
depend on how your build is configured.  You can expect to find\r
these binary outputs:\r
* OVMF.FD\r
  - Please note!  This filename has changed.  Older releases used OVMF.Fv.\r
* OvmfVideo.rom\r
  - This file is not built separately any longer, starting with svn r13520.\r
\r
More information on building OVMF can be found at:\r
\r
http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=How_to_build_OVMF\r
\r
=== RUNNING OVMF on QEMU ===\r
\r
* QEMU 0.9.1 or later is required.\r
* Either copy, rename or symlink OVMF.FD => bios.bin\r
* Be sure to use qemu-system-x86_64, if you are using and X64 firmware.\r
  (qemu-system-x86_64 works for the IA32 firmware as well, of course.)\r
* Use the QEMU -L parameter to specify the directory where the bios.bin\r
  file is located.\r
* The EFI shell is built into OVMF builds at this time, so it should\r
  run automatically if a UEFI boot application is not found on the\r
  removable media.\r
* On Linux, newer version of QEMU may enable KVM feature, and this might\r
  cause OVMF to fail to boot.  The QEMU '-no-kvm' may allow OVMF to boot.\r
* Capturing OVMF debug messages on qemu:\r
  - The default OVMF build writes debug messages to IO port 0x402.  The\r
    following qemu command line options save them in the file called\r
    debug.log: '-debugcon file:debug.log -global isa-debugcon.iobase=0x402'.\r
  - It is possible to revert to the original behavior, when debug messages were\r
    written to the emulated serial port (potentially intermixing OVMF debug\r
    output with UEFI serial console output).  For this the\r
    '-D DEBUG_ON_SERIAL_PORT' option has to be passed to the build command (see\r
    the next section), and in order to capture the serial output qemu needs to\r
    be started with eg. '-serial file:serial.log'.\r
  - Debug messages fall into several categories.  Logged vs. suppressed\r
    categories are controlled at OVMF build time by the\r
    'gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel' bitmask (an UINT32\r
    value) in the selected .dsc file.  Individual bits of this bitmask are\r
    defined in <MdePkg/Include/Library/DebugLib.h>.  One non-default bit (with\r
    some performance impact) that is frequently set for debugging is 0x00400000\r
    (DEBUG_VERBOSE).\r
  - The RELEASE build target ('-b RELEASE' build option, see below) disables\r
    all debug messages.  The default build target is DEBUG.\r
\r
=== Build Scripts ===\r
\r
On systems with the bash shell you can use OvmfPkg/build.sh to simplify\r
building and running OVMF.\r
\r
So, for example, to build + run OVMF X64:\r
$ OvmfPkg/build.sh -a X64\r
$ OvmfPkg/build.sh -a X64 qemu\r
\r
And to run a 64-bit UEFI bootable ISO image:\r
$ OvmfPkg/build.sh -a X64 qemu -cdrom /path/to/disk-image.iso\r
\r
To build a 32-bit OVMF without debug messages using GCC 4.5:\r
$ OvmfPkg/build.sh -a IA32 -b RELEASE -t GCC45\r
\r
=== Network Support ===\r
\r
To add network drivers to OVMF:\r
\r
* Download UEFI drivers for the e1000 NIC\r
  - http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=17515&lang=eng\r
  - Install the drivers into a directory called Intel3.5 in your WORKSPACE\r
\r
* Include the drivers in OVMF during the build:\r
  - Add '-D NETWORK_ENABLE' to your build command\r
  - For example: build -D NETWORK_ENABLE\r
\r
* Use the QEMU -net parameter to enable NIC support.\r
  - QEMU does not support UEFI DHCP or UEFI PXE Boot, so long timeouts will\r
    occur when NICs are enabled.  The long timeouts can be avoided by\r
    interrupts the boot sequence by pressing a key when the logo appears.\r
  - Example: Enable e1000 NIC with a DHCP server and restrict packet\r
    forwarding:\r
    -net nic,model=e1000 -net user,restrict=yes -net user,dhcpstart=10.0.2.10\r
  - Example: Enable e1000 NIC with a DHCP server, restrict packet forwarding,\r
    and generate PCAP file:\r
    -net nic,model=e1000 -net user,restrict=yes -net user,dhcpstart=10.0.2.10\r
    -net dump,file=a.pcap\r
  - Example: Enable 2 e1000 NICs with a DHCP server and restrict\r
    packet forwarding:\r
    -net nic,model=e1000,addr=3 -net nic,model=e1000,addr=4\r
    -net user,restrict=yes -net user,dhcpstart=10.0.2.10\r
\r
=== UNIXGCC Debug ===\r
\r
If you build with the UNIXGCC toolchain, then debugging will be disabled\r
due to larger image sizes being produced by the UNIXGCC toolchain. The\r
first choice recommendation is to use GCC44 or newer instead.\r
\r
If you must use UNIXGCC, then you can override the build options for\r
particular libraries and modules in the .dsc to re-enable debugging\r
selectively. For example:\r
  [Components]\r
  OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf {\r
    <BuildOptions>\r
      GCC:*_*_*_CC_FLAGS             = -UMDEPKG_NDEBUG\r
  }\r
  IntelFrameworkModulePkg/Universal/BdsDxe/BdsDxe.inf {\r
    <BuildOptions>\r
      GCC:*_*_*_CC_FLAGS             = -UMDEPKG_NDEBUG\r
  }\r
\r