[coreboot] When does AMD release the fam15 spectre microcode updates?

[awokd]

On Tue, April 17, 2018 10:31 am, Rudolf Marek wrote:
> Hi,
>
>
> Dne 17.4.2018 v 12:09 awokd via coreboot napsal(a):
>
>> At what byte locations in the header is the equivalence table? I was
>> looking for this...
>
> Hm I'm not aware where is it documented, or if there is some tool to
> manipulate it/dump the structure. Maybe it could be added to some existing
> tool?

I ran into that too, couldn't find it documented anywhere!

> Here is what I deduced from Linux arch/x86/kernel/cpu/microcode/amd.c
> + header files
>
>
> + 0 u32 UCODE_MAGIC
> + 4 u32 UCODE_EQUIV_CPU_TABLE_TYPE (0x0)
> + 8 u32 size of following equiv table say "N"
>
>
> Then this follows, the last table has installed_cpu_cpuid == 0
>
>
> u32 installed_cpu_cpuid u32 fixed_errata_mask u32 fixed_errata_compare u16
> equiv_cpu u16 res
>
> + N u32 UCODE_UCODE_TYPE (0x1)
> + N + 4 u32 sizeof blob (without this header)
> + N + 8 microcode blob from github follows here
> ...
> Then after that, there clould be again
>
>
> + X u32 UCODE_UCODE_TYPE
> + X + 4 u32 SECTION_SIZE
> + X + 8 microcode header (blob from github follows here)

Thank you; I'll try to cross-reference against the AGESA code and see if I
can work it out. That was the only way I could get my corebooted system to
recognize my equivalent CPU for microcode updates before.