[U-Boot-Users] sypcr double written
Jerry Van Baren
gerald.vanbaren at smiths-aerospace.com
Tue May 23 22:47:42 CEST 2006
Antonio Di Bacco wrote:
> wdt_mpc8xx.c is in the kernel, in the drivers/char/wdt_mpc8xx.c
> On Tuesday 23 May 2006 22:31, Wolfgang Denk wrote:
>> In message <200605232124.05181.antonio.dibacco at aruba.it> you wrote:
>>> I saw that in cpu_init_f the sypcr is written and it is also written in
>>> the init of wdt_mpc8xx.o but this should not be possible according to the
>>> MPC885 Reference Manual.
>> It is not possible, but then: what's wdt_mpc8xx.o? This is not part
>> of U-Boot.
>>> For sure there is an explanation for this, anyone knows?
>> Um... and if you're talking about any Linux kernel code - who says
>> that it's been booted by U-Boot, or that the boot loader initialized
>> the SYPCR?
>> Best regards,
>> Wolfgang Denk
Well, strictly speaking it _is_ possible to write the SYPCR more than
once, it just doesn't do anything because the CPU ignores all but the
first write. Whatever wdt_mpc8xx.o writes is ignored in this case.
P.S. Please don't top post.
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