vr4131 : cache/linesize

[Filip Onkelinx <Filip@xxxxxxxxx>]

Hi all,

I'm currently trying to get kernel 2.6.8 running on a Casio BE-300, a 
NEC VR4131 (rev1.2) based PDA.

I noticed a (for me) strange result when comparing 2.4 with 2.6,  please 
have a look at the linesize below:
kernel 2.4.18:
  CPU revision is: 00000c80
  Primary instruction cache 16kb, linesize 32 bytes.
  Primary data cache 16kb, linesize 16 bytes.
kernel 2.6.8:
  Primary instruction cache 16kB, physically tagged, 2-way, linesize 16 
bytes.
  Primary data cache 16kB 2-way, linesize 16 bytes.

Any idea why the reported icache linesize is different between2.4 and 
2.6 ? Which one should I trust ?

and from the original botloader it looks like at boot config is set to:
# [4    ] DB: 0= data cache refill size=4 words
# [5    ] IB: 1=instruction cache refill size=8 words
# [6-8  ] DC: 100= data cache size, 16K
# [9-11 ] IC: 101= instruction cache size, 16K.

Is it common to have different dcache/icache  refill sizes ?

Thanks for your time,

Filip.



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Do not follow where the path may lead. Go instead where there is no path and leave a trail  - Ralph Waldo Emerson

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Filip Onkelinx
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filip@xxxxxxxxxxxx