Eric,
I verified the exchange the cpufixup after the cache_on...mtrr_check in cpu. c for S2882.
Found one interesting thing 1. In fallback mode, it does not pause after "Clearing LinuxBIOS memory " and "Copying LinuxBIOS to ram". 2. In normal node, it does pause after the "Clearing" and "Copying" ( 5s and 4s).
What could cause that?
Regards
YH -----邮件原件----- 发件人: ron minnich [mailto:rminnich@lanl.gov] 发送时间: 2004年3月28日 21:03 收件人: Eric W. Biederman 抄送: Li-Ta Lo; LinuxBIOS 主题: Re: Cache On and ECC clear
On 28 Mar 2004, Eric W. Biederman wrote:
But please break it out into it's own separate inline function.
It has two very strong requirements.
- That we never trigger a hardware read on the addresses were are
clearing
before we have triggered a hardware write. The fact I setup the area as uncached but write-combining ensures this. 2) That this code runs very fast. It needs to be able to run at 6.4GB/s when you have dual channel PC3200 DDR installed. This is one of the reasons we run it on a per cpu basis. The loop can only run at 4.0GB/s from the other cpu.
ok, if it stays assembly this explanation will be put in with it.
ron
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