[coreboot] coreboot on s4882?

Myles Watson mylesgw at gmail.com
Fri Feb 6 14:34:15 CET 2009

On Fri, Feb 6, 2009 at 4:21 AM, David Melik <dchmelik at gmail.com> wrote:
> On 2/6/09, Myles Watson <mylesgw at gmail.com> wrote:
>> Do you have a null-modem cable?  Did you see anything on the serial
>> console?
> I have such cables; maybe not a serial console, but away from university I
> have some old analog monitors....

Serial console in this context refers to connecting the serial port of
the s4882 to another machine's via null modem cable and using a
terminal emulator program like minicom, gtkterm, etc. on the other
machine to see what the s4882 is writing to the serial port.

>> [...] if you grep the source for post_code you'll find some.
> Good.  I will try this weekend.
>> What size is your coreboot.rom (ls -l)?  What size is your chip?
>> That's a frequent problem.  If you had to add another ROM, did you
>> prepend it?
> The .rom (saved on a WD 24000 that Slackware 10.2 cannot mount) size had
> '5:' over 512 Kb I guess. The manual says 4 MB.  Apparently my ROM is too
> small... I doubt I need certain grub2 modules, but I know not what others
> do.
It's important that the size is exact.  Flash is sized in megabits, so
4 Mbits = 512KB.  This probably isn't the problem, I just wanted to
make sure.

There is a lot of valuable information on coreboot.org.  I recommend
reading through the developer pages.


> Would it help Coreboot more if I make a smaller grub2 to test newer
> coreboot2 on s4882 asap or if wait a while and 'prepend' (if it involves
> soldering that is alright.)  I know It can be specially configured; maybe
> that needs more ROM.
>> Have you tried it with a warm reset?  It's a bit of a long shot, but
>> it can affect things sometimes.
> I think I at least tried or also turned it on later 1 - 3 times.
>> It is very unlikely that it is reaching the payload.  [...]  Grub2 from
>> buildrom works well as long as you substitute ata for hd in the
>> grub.cfg.
> I may try but would like to try serial consoles:
>> > I neither want to re-flash [old] BIOS nor yet try coreboot on my
>> > alternate
>> > Slackware system[....]
> --David
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