[ECOS] Possible loss of PowerPC mpc8xx Interrupts

[Jonathan Larmour]

Jonathan Larmour wrote:
>> We have found a problem that could cause the loss of edge triggered
>> interrupts.
>>[snip]
>> The HAL_READ_UINT32 will read the SIPEND register which will contain two
>> bits that are set (one for each interrupt) this will then be written 
>> back to
>> the SIPEND register and will clear both interrupts.

So as per this, I've checked in the attached patch, which also follows 
Gary's request to check the other interrupt acks in that function.

Jifl
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