[coreboot] it boots! [was: re: H8DME-2 woes, continued....]

Peter Stuge peter at stuge.se
Wed May 12 02:01:28 CEST 2010

Joe Korty wrote:
> I applied the below patch to skip 'codec' initialization (whatever
> that is) and I was able to boot up to linux.

Where did you find the suggestion to do it?

> Can anyone explain what the codec is; perhaps we can turn this
> 'feature' off permanently?  (or make it a .config option).

The codec in this case is the chip that converts digital signals into
audible sound. It's part of the integrated soundcard in the chipset.
It should certainly not cause a hang..

The bad part is that we have no docs for MCP55.

In any case, there is code like this in

        do {
                dword = read32(base + 0x68);
        } while (dword & 1);

And that's bad. We shouldn't have code like this anywhere in
coreboot. It should get a timeout of some sort, so that it doesn't
hang forever.

A simple counter would be a great start, but it would of course be
best to understand why the code doesn't work on your system..

Can you check which codec you have please? Linux reports this. From
my laptop:

[    3.509587] ALSA device list:
[    3.509593]   #0: Intel 82801DB-ICH4 with AD1981B at irq 17

AD1981B is the codec.


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