[U-Boot-Users] ICACHE and ARM ???

[U-Boot-Users] ICACHE and ARM ???

[Steven Scholz]

Hi there,

my new board using Atmel's AT91RM9200 is booting now straight up to the bash!

But I noticed that the cache is _not_ enabled while U-Boot is running.
That makes tftp und bootm very slow indeed.

Now, enabling and disabling icache by accessing CP15, Reg 1 using a BDI2000 
works fine. The speed up is remarkable.

But the icache command does not work as I woud ecpect:

MulitIO> icache
p15/c1 is = c000007c
Instruction Cache is OFF

MulitIO> icache on
icache_enable(145)
p15/c1 is = c000007c
write c000107c to p15/c1
p15/c1 is = 0000617c
p15/c1 is = 0000617c
Instruction Cache is OFF

Hmm. So instead of just setting Bit 12 three other bits are set.

Is someone using icache on ARM systems?

Thanks.

-- 
Steven Scholz

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