[U-Boot] p4080ds starts OS with MSR[EE]=1 and DEC armed?

[Kumar Gala]

On Mar 14, 2011, at 2:39 PM, Jimi Xenidis wrote:

> On Mar 14, 2011, at 1:09 PM, Scott Wood wrote:
>> 
>> On Sat, 12 Mar 2011 16:56:09 -0600
>> Kumar Gala <galak at kernel.crashing.org> wrote:
>> 
>>> 
>>> On Mar 3, 2011, at 8:59 AM, Jimi Xenidis wrote:
>>> 
>>>> I was surprised to find myself at the decrement interrupt when running my new stuff.
>>>> That is against ePAPR, right?
>>>> Does u-boot at least make sure that the DEC is set to some large value before it leaps at me?
>>>> I don't mind forcing EE=0 but I'd like to make sure I make it that far into the code :)
>>>> -JX
>>> 
>>> Jimi,
>>> 
>>> Not sure how or why you are seeing this, but u-boot should disable interrupts in common/cmd_bootm.c
>>> 
>>> Look for disable_interrupts() -> this should set MSR[EE] = 0.
>> 
>> What about the rest of MSR -- ME/CE/DE?
> 
> I can attest that MSR=0 when my program takes over.
> BTW: secondary CPUs have MSR[IS|DS] == 0b11

The spin in such a mapping, but when released out of spin they should be in a MSR[IS|DS] = 0b00 mapping.

- k