[coreboot] Trouble converting Truxton to CAR

Uwe Hermann uwe at hermann-uwe.de
Tue Nov 2 23:03:23 CET 2010

On Tue, Nov 02, 2010 at 10:43:08AM -0700, Dustin Harrison wrote:
> Indeed, I enabled the ramtest and see failures starting at 0xCFE14
> which is inside the CAR space (DCACHE_RAM_SIZE is 0x8000 in my case
> which should make the CAR range 0xC8000-0xCFFFF).  My (naive) ideas
> are that either writes are getting sent to the SDRAM which prevents
> the raminit code from working or that CAR is not being
> (successfully) disabled after raminit due to some unique feature of
> this CPU.  The reason I was asking about a method for validating the
> CAR code for this CPU is because this CPU supports a feature to
> share memory (for DMA purposes) with an accelerated services unit
> (ASU).  Thus I jumped to the conclusion that this may affect the CAR
> routines.

Maybe. Can you post your patch for review and if possible the URL for
the CPU datasheet?

Thanks, Uwe.
http://hermann-uwe.de     | http://sigrok.org
http://randomprojects.org | http://unmaintained-free-software.org

More information about the coreboot mailing list