cache init problems - (non multi-mimed mail )

[randy kim]

Hi..

I have a problem for porting PPC-BOOT to STT755EMC.

Here is my BD spec.

CPU: MPC750 ( main core ) + MPC8260 ( companion only )
L2 cache:  1M
SDRAM on 60x bus: 64M
SDRAM on Local bus: 32M
FLASH: 8MB
10/100 Base T port on FFC2
Dual RS232 port residing SMC1 & SMC2.


The problem is  cache.
Whenever boot process reach at cache init code,
all system is stoped!. No more progress!
But if the cache init code is commented out from boot codes,
Everything's fine except perfomence.

I don't know why the code doesn't work. please help..

Here is the code i used.

/* icache_enable */
mfspr   r3, HID0
li  r5, HID0_ICFI|HID0_ILOCK
andcr3, r3, r5
ori r3, r3, HID0_ICE
ori r5, r3, HID0_ICFI
mtspr   HID0, r5
mtspr   HID0, r3
isync

 /* dcache_enable */
mfspr   r3,HID0
ori r3,r3,HID0_DCE | HID0_DCFI
sync
mtspr   HID0,r3

Thanks

ps ) sorry for my previous Multi-mimed mail.


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cache init problems - (non multi-mimed mail )

[Wolfgang Denk]

In message <200304240452.h3O4qrq04070 at www.cnetia.com> you wrote:
>
> I have a problem for porting PPC-BOOT to STT755EMC.

Do  not  spend  effort  for  PPCBoot.  PPCBoot  is  a  dead  project,
development  has  been  discontiuned  half a year ago. Please use the
successort project U-Boot instead.

You better post U-Boot related questions on the u-boot-users  mailing
list. Chances for helpful replies are better then.

> Here is the code i used.
>
> /* icache_enable */
> mfspr   r3, HID0
> li  r5, HID0_ICFI|HID0_ILOCK
> andcr3, r3, r5
> ori r3, r3, HID0_ICE
> ori r5, r3, HID0_ICFI
> mtspr   HID0, r5
> mtspr   HID0, r3
> isync
>
>  /* dcache_enable */
> mfspr   r3,HID0
> ori r3,r3,HID0_DCE | HID0_DCFI
> sync
> mtspr   HID0,r3

Why don't you use the existing code which works fine on a  couple  of
systems?  The  dcache_enable  code you present here is different from
the code present in PPCboot and in U-Boot.  It  seems  you  tried  to
"optimize" it, but without understanding it.


Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
If the facts don't fit the theory, change the facts.
   -- Albert Einstein

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