On 05/18/17 17:14, Laszlo Ersek wrote: > Cc: Jordan Justen <jordan.l.jus...@intel.com> > Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=527 > Contributed-under: TianoCore Contribution Agreement 1.0 > Signed-off-by: Laszlo Ersek <ler...@redhat.com> > --- > > Notes: > v2: > - no changes > > OvmfPkg/README | 39 ++++++++++++++++---- > 1 file changed, 31 insertions(+), 8 deletions(-) > > diff --git a/OvmfPkg/README b/OvmfPkg/README > index 304e69fbe545..33ff9432bb3e 100644 > --- a/OvmfPkg/README > +++ b/OvmfPkg/README > @@ -245,15 +245,20 @@ longer.) > > === OVMF Flash Layout === > > -Like all current IA32/X64 system designs, OVMF's firmware > -device (rom/flash) appears in QEMU's physical address space > -just below 4GB (0x100000000). > +Like all current IA32/X64 system designs, OVMF's firmware device (rom/flash) > +appears in QEMU's physical address space just below 4GB (0x100000000). > > -The layout of the firmware device in memory looks like: > +OVMF supports building a 1MB, 2MB or 4MB flash image (see the DSC files for > the > +FD_SIZE_1MB, FD_SIZE_2MB, FD_SIZE_4MB build defines). The base address for > the > +1MB image in QEMU physical memory is 0xfff00000. The base address for the 2MB > +image is 0xffe00000. The base address for the 4MB image is 0xffc00000. > + > +Using the 1MB or 2MB image, the layout of the firmware device in memory looks > +like: > > +--------------------------------------- 4GB (0x100000000) > | VTF0 (16-bit reset code) and OVMF SEC > -| (SECFV) > +| (SECFV, 208KB/0x34000) > +--------------------------------------- varies based on flash size > | > | Compressed main firmware image > @@ -271,9 +276,27 @@ The layout of the firmware device in memory looks like: > | area (56KB/0xe000) > +--------------------------------------- base address > > -OVMF supports building a 1MB or a 2MB flash image. The base address for > -a 1MB image in QEMU physical memory is 0xfff00000. The base address for > -a 2MB image is 0xffe00000. > +Using the 4MB image, the layout of the firmware device in memory looks like: > + > ++--------------------------------------- base + 0x400000 (4GB/0x100000000) > +| VTF0 (16-bit reset code) and OVMF SEC > +| (SECFV, 208KB/0x34000) > ++--------------------------------------- base + 0x3cc000 > +| > +| Compressed main firmware image > +| (FVMAIN_COMPACT, 3360KB/0x348000) > +| > ++--------------------------------------- base + 0x84000 > +| Fault-tolerant write (FTW) > +| Spare blocks (264KB/0x42000) > ++--------------------------------------- base + 0x42000 > +| FTW Work block (4KB/0x1000) > ++--------------------------------------- base + 0x41000 > +| Event log area (4KB/0x1000) > ++--------------------------------------- base + 0x40000 > +| Non-volatile variable storage > +| area (256KB/0x40000) > ++--------------------------------------- base address (0xffc00000) > > The code in SECFV locates FVMAIN_COMPACT, and decompresses the > main firmware (MAINFV) into RAM memory at address 0x800000. The >
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