Re: [microblaze-uclinux] RE: CONFIG_OPT_LIB_FUNCTION crashes kernel without a barrel shifter

[Michal Simek <michal.simek@xxxxxxxxxxxxx>]

John Linn wrote:
>> -----Original Message-----
>> From: John Linn
>> Sent: Friday, October 23, 2009 1:01 PM
>> To: microblaze-uclinux@xxxxxxxxxxxxxx
>> Subject: CONFIG_OPT_LIB_FUNCTION crashes kernel without a barrel
> shifter
>> On an MMU kernel, I see that when this feature is enabled in the
> kernel config, and there is no
>> barrel shifter in h/w, the kernel won't boot.
>>
>> I believe the lack of barrel shifter is the cause, but not 100%
> confident.
> 
> It looks like you have to have both of these for the failure to boot.
> 
> CONFIG_OPT_LIB_FUNCTION=y
> CONFIG_OPT_LIB_ASM=y

yes, you are right - asm implementation use barrel-shifter instruction.

Thanks,
Michal


> 
>> The help in the kernel config indicates it might be sub-optimal, but
> not crashing.  The mmu_defconfig
>> uses this option.
>>
>> Thanks,
>> John
> 
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-- 
Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
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