[coreboot] Thin Client Compaq Evo T20

Philip Loewen philip at tidepool.ca
Fri May 23 17:32:26 CEST 2008

Juergen Beisert wrote:
> On Friday 23 May 2008 09:19, Markus wrote:
>> Am Thu, 22 May 2008 23:58:35 -0700
>> schrieb Philip Loewen <philip at tidepool.ca>:
>>> Right now I only know how to access the 48M of onboard flash
>>> memory in this little box using the proprietary tools that
>>> run in the proprietary BIOS. If I replace the BIOS with
>>> coreboot, I will need some other way to access the NAND
>>> flash memory. Is there a known working method for this that
>>> runs on Linux? (I have tried adding support for Memory
>>> Technology Devices to my kernel, but I don't know how to tell
>>> if they are working.) 
>> On my Evo T30 the internal flash works as an hda Disk. The only bad
>> thing on this. The fist partition is needed from the proprietary Bios.
>> Are you able to boot an Linux and take a look?
> This kind of NAND devices (DiskOnChip in my box) provides a simple BIOS 
> extension. They hook themselves into the boot interrupt of a proprietary 
> BIOS. So they can emulate a harddisk to boot from. IMHO for coreboot we need 
> a different solution.

Linux kernel 2.6.24-gentoo-r4 runs well for me, but I don't 
know where to look for internal flash memory access. There 
are no disk-like devices listed in /dev. (/dev is populated 
automatically by udev at boot time ... but being a gentoo 
user means never feeling quite sure everything is configured 
right.) The file /proc/devices shows 16 block devices of 
type 'sd': I don't know what these are, but none of the 
other possibilities listed in /proc/devices seem likely to me.

Thanks! - Philip

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