[coreboot] Strange corruption with printk

Myles Watson mylesgw at gmail.com
Tue Mar 9 03:16:01 CET 2010

> On 09.03.2010 00:18, Myles Watson wrote:
> > I divided the CAR copy into pieces to debug memory corruption that I'm
> > seeing.  It seems to fit a pattern, but I'm not sure what would be
> causing
> > it.  Any ideas would be appreciated.
> >
> To be honest, if post_cache_as_ram() works at all on K8, it is mostly
> luck.

> The memory copy is not inline asm (will lead to subtle
> corruption), the memory copy and the stack switching are not in one
> inline asm block (gcc is free to insert arbitrary code in between), and
> the stack is switched in the middle of a function (gcc may use some
> non-clobbered regs to access the old stack, or simply die).
> Throwing out the complete v2 K8 CAR disabling code and replacing it with
> the v3 code is one of the possible fixes.
Unfortunately, v3 never worked for K8.


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