Hum,
The machine seems to be acting strange, but it boots normally
and applications run (more importantly there is no TLB entry
which could cause dcbst fault strangeness).
Some "dd" hangs till I press "ctrl+c", others just work. Really strange.
G'night, I'll look at it tomorrow.
[root@(none) /]# time dd if=/dev/zero of=file bs=16k count=400
400+0 records in
400+0 records out
real 0m4.261s
user 0m0.040s
sys 0m1.240s
[root@(none) /]# time dd if=/dev/zero of=file bs=32k count=400
real 0m50.369s
user 0m0.040s
sys 0m1.680s (ctrl+c)
[root@(none) /]#
> --- a/arch/ppc/kernel/head_8xx.S.orig 2005-04-04 19:43:23.000000000 -0300
> +++ b/arch/ppc/kernel/head_8xx.S 2005-04-04 19:47:40.000000000 -0300
> @@ -359,9 +359,7 @@
>
> . = 0x1200
> DataStoreTLBMiss:
> -#ifdef CONFIG_8xx_CPU6
> stw r3, 8(r0)
> -#endif
> DO_8xx_CPU6(0x3f80, r3)
> mtspr M_TW, r10 /* Save a couple of working registers */
> mfcr r10
> @@ -390,6 +388,16 @@
> mfspr r10, MD_TWC /* ....and get the pte address */
> lwz r10, 0(r10) /* Get the pte */
>
> + li r3, 0
> + cmpw r10, r3 /* does the pte contain a valid address? */
> + bne 4f
> + mfspr r10, M_TW /* Restore registers */
> + lwz r11, 0(r0)
> + mtcr r11
> + lwz r11, 4(r0)
> + lwz r3, 8(r0)
> + b DataAccess
> +4:
> /* Insert the Guarded flag into the TWC from the Linux PTE.
> * It is bit 27 of both the Linux PTE and the TWC (at least
> * I got that right :-). It will be better when we can put
> @@ -419,9 +427,7 @@
> lwz r11, 0(r0)
> mtcr r11
> lwz r11, 4(r0)
> -#ifdef CONFIG_8xx_CPU6
> lwz r3, 8(r0)
> -#endif
> rfi
>
> /* This is an instruction TLB error on the MPC8xx. This could be due
