[coreboot] SPD binaries in coreboot
Alex G.
mr.nuke.me at gmail.com
Sat Oct 24 00:22:28 CEST 2015
On 10/23/2015 08:32 AM, ron minnich wrote:
> Build the tool in go.
Not everybody knows or wants to learn go.
> It's trivial. If you have an idea how it ought to
> work I can set it up in the playground in a few minutes.
>
> ron
>
> On Fri, Oct 23, 2015 at 8:24 AM Patrick Georgi <pgeorgi at google.com
> <mailto:pgeorgi at google.com>> wrote:
>
> Hi,
>
> Some mainboards come with soldered-on memory without SPD ROM. For
> these, we carry the SPD data in coreboot.
>
> Currently, they're stored in a hexdump format that is then converted
> to binary at build time. The various mechanisms of doing so fail on
> some platform or another:
> - "echo -e -n $stuff" isn't well-liked by some shells (emits "e -n
> $stuff")
> - "printf '\x42'" isn't well-liked by some shells (or /usr/bin/printf
> tools) that don't support hexadecimal formats
> - "printf '\0377'" isn't well-liked by some non-conforming, but
> existing shells
> - xxd -rg1 $file > $file.bin requires xxd, which comes with vim and
> may just not exist
>
> I see essentially two ways out of this, before we can start reducing
> duplication across the tree in that area:
> We could build our own tool to parse hex files and dump binary, or we
> could ship SPD data as binary from the start (and only have to
> concatenate them).
>
> The second option has the appeal of being much simpler (and there
> isn't really a "preferred form" for editing SPD data that I'm aware of
> - is there?), but looks icky at a glance because it's binary (but it's
> really just as impenetrable as the equivalent hexdump).
>
> So what do these files contain? Parameters (as in: facts) about the
> hardware's size, layout, and timing, and a bunch of vendor/model
> identifier strings.
>
>
> So, is there a third option that I'm missing? Other opinions?
> Patrick
> --
> Google Germany GmbH, ABC-Str. 19, 20354 Hamburg
> Registergericht und -nummer: Hamburg, HRB 86891, Sitz der
> Gesellschaft: Hamburg
> Geschäftsführer: Matthew Scott Sucherman, Paul Terence Manicle
>
> --
> coreboot mailing list: coreboot at coreboot.org
> <mailto:coreboot at coreboot.org>
> http://www.coreboot.org/mailman/listinfo/coreboot
>
>
>
More information about the coreboot
mailing list