[coreboot] Patch merged into coreboot/master: c35c461 Invalidate cache before first jump

[Bao, Zheng]

I tried. It behaves as bad as wbinvd does.

Joe

> -----Original Message-----
> From: Andrew Goodbody [mailto:ajg4tadpole at gmail.com]
> Sent: Tuesday, April 10, 2012 7:04 PM
> To: Bao, Zheng
> Cc: 'Marc Jones'; Marc Jones; 'coreboot at coreboot.org'
> Subject: Re: [coreboot] Patch merged into coreboot/master: c35c461
> Invalidate cache before first jump
> 
> On 09/04/12 04:24, Bao, Zheng wrote:
> > Hi,
> > It is unstable. In most cases, it hangs at this wbinvd. Once it pass
> that instruction, it will hang at when AP cores are launched.
> 
> Try invd instead of wbinvd. There should be no need to preserve
> anything
> from the cache so the write back is not needed. The write back may also
> need functional memory which will not be there at least from power on.
> Also note that these instructions are 486+ only.
> 
> Andrew