[U-Boot-Users] cpu/mips/start.S relocate_code problem

[zhuzhenhua]

i do some copy befor mips_cache_lock in cpu/mips/start.S(and after
mips_cache_reset), it works well.
but if a do copy in relocate_code function, for every 16 bytes, only
last 4 bytes is copy correctly.
i think it maybe caused by cache operate,because cache line size is 16
byte,and between these two copy test, there is only mips_cache_lock
operate the cache.

and for the mips_cache_lock, i think it only affect sp,but someone
said it affect the gp?

so if mips_cache_lock only affect sp, i can remove it ,because i have
init sdram in lowlevel_init.S, and i can give sp a sdram address.

So my question:
1. does mips_cache_lock affect the copy from flash to sdram?
2.does mips_cache_lock only affect sp?




On 11/13/05, Wolfgang Denk <wd at denx.de> wrote:
> In message <50c9a2250511130043t19cd2d62r274c6eb4ffdb4e72 at mail.gmail.com> you wrote:
> > in t he relocate_code function, i set src, dest,end addess
> > correctly,and the copy loop end do not give eror,but the sdram have
> > not the code, does this caused by cache?
>
> No. More likely it's caused by bad SDRAM initialization. Read the FAQ.
>
> Best regards,
>
> Wolfgang Denk
>
> --
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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>