[coreboot] SPD binaries in coreboot
adurbin at google.com
Fri Oct 23 20:35:12 CEST 2015
This one's for Ron.
On Fri, Oct 23, 2015 at 10:32 AM, ron minnich <rminnich at gmail.com> wrote:
> Build the tool in 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.
> On Fri, Oct 23, 2015 at 8:24 AM Patrick Georgi <pgeorgi at google.com> wrote:
>> 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
>> - "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
>> - 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?
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