Hi Jorge,
I see you have AMD platform, so things may look differently than in the
linked patch. The example FMD file that could work for you (1 RW
partition only):
FLASH@0xff800000 0x800000 {
RW_UNUSED@0x0 0x20000
AMDFW(PRESERVE)@0x20000 0x90000
SI_BIOS@0xb0000 0x750000 {
RW_SECTION_A 0x200000 {
VBLOCK_A 0x10000
FW_MAIN_A(CBFS)
RW_FWID_A 0x40
}
CONSOLE 0x10000
SMMSTORE(PRESERVE) 0x40000
RW_VPD(PRESERVE) 0x4000
WP_RO {
FMAP@0x0 0x800
RO_FRID 0x40
RO_FRID_PAD 0x7c0
RO_VPD(PRESERVE) 0x4000
GBB 0x1e000
COREBOOT(CBFS)
}
}
}
Important to select AMDFW_OUTSIDE_CBFS when using this flashmap layout.
Save the content to the board.fmd file and fill the file path in the
menuconfig: General -> fmap description file in fmd format
You may want to choose different sizes of partitions etc. This is just
an example.
Regards,
Michał
On 13.11.2019 12:35, Jorge Fernandez Monteagudo wrote:
> Hi Michal!
>
>> You need to reserve some CMOS memory for vboot context, set default
>> vboot configuration in Kconfig of your platform and prepare a flashmap
>> layout file (*.fmd) - its the simplest case. Additionally you should
>> have at least one RW slot by selecting CONFIG_VBOOT_SLOTS_RW_A.
> Could you please advise how to implement the flashmap layout file to reserve
> space for the RW partition? When coreboot rom is compile without VBOOT
> I get the next info:
>
> Name Offset Type Size Comp
> cbfs master header 0x0 cbfs header 32 none
> fallback/romstage 0x80 stage 32260 none
> fallback/ramstage 0x7f00 stage 64238 none
> cmos_layout.bin 0x17a40 cmos_layout 1516 none
> fallback/dsdt.aml 0x18080 raw 6656 none
> (empty) 0x19b00 null 25240 none
> apu/amdfw 0x1fdc0 raw 560128 none
> pci1002,9874.rom 0xa8a00 optionrom 64512 none
> fallback/payload 0xb8680 simple elf 2627296 none
> (empty) 0x339dc0 null 2908120 none
> AGESA 0x5ffdc0 raw 690436 none
> (empty) 0x6a8740 null 1405592 none
> bootblock 0x7ffa00 bootblock 944 none
>
> and the default fmd map:
>
> # layout for firmware residing at top of 4GB address space
> # +-------------+ <-- 4GB - ROM_SIZE / start of flash
> # | unspecified |
> # +-------------+ <-- 4GB - BIOS_SIZE
> # | FMAP |
> # +-------------+ <-- 4GB - BIOS_SIZE + FMAP_SIZE
> # | CBFS |
> # +-------------+ <-- 4GB / end of flash
>
> FLASH@4286578688 0x800000 {
> BIOS@0 8388608 {
> FMAP@0 0x200
> COREBOOT(CBFS)@512 8388096
> }
> }
>
> Thanks!
> Jorge
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--
Michał Żygowski
Firmware Engineer
http://3mdeb.com | @3mdeb_com
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