[coreboot] Samsung 550 Chromebook own Coreboot

John Lewis jlewis at johnlewis.ie
Mon Jul 29 20:12:30 CEST 2013


On 29/07/2013 16:47, Aaron Durbin wrote:

> On Mon, Jul 29, 2013 at 10:38 AM, John Lewis <jlewis at johnlewis.ie> 
> wrote:
>
>> My 550 won't boot without the DIMM in, so it sounds like it's not
>> recognising the embedded memory.
>
> OK. That is a good data point. However, I don't know from what code
> base that original wrapper was built from in order to debug further.
> Did you save the original rom image that your device was shipped 
> with?
> I'd be curious to know if that matches the one found in the blobs
> repo.

You can find it at http://johnlewis.ie/bios.bin and the mrc.bin's are 
different by a few kilobytes. I can also tell you that if I try to use 
that mrc.bin with straight Coreboot I get a nice brick. ;)

>
>> On 29/07/2013 16:25, Aaron Durbin wrote:
>>
>>> On Mon, Jul 29, 2013 at 10:22 AM, Kyösti Mälkki
>>> <kyosti.malkki at gmail.com [1]> wrote:
>>>
>>>> Did someone change the SPD eeprom address notation in pei_data 
>>>> from
>>>> 7-bit to 8-bit addresses? samsung/lumpy/romstage.c : 
>>>> .spd_addresses
>>>> = { 0x50, 0x00,0xf0,0x00 }, google/stout/romstage.c :
>>>> spd_addresses: { 0xA0, 0x00,0xA4,0x00 },
>>> The 0xf0 handles the soldered down memory. I was looking at the 
>>> 0x50
>>> address as well, but I think that is correct (I'm looking at code
>>> that I think is the wrapper that you guys are using). I could be
>>> wrong though.






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