Re: IXP_NPE Driver Inclusion proposal

Marc Singer wrote:
> On Thu, Sep 14, 2006 at 11:04:00PM +0930, Rod Whitby wrote:
>> So does that mean that the absolute maximum possible microcode size for
>> any IXP4[26]X device is 3 x 24k = 132Kb uncompressed?
>>
>> We happen to have just under 124Kb free in the last block, so it seems
>> we can support all the microcode we desire, and only really need to
>> compress it in an absolute worst case (definitely not for the IXP42X for
>> instance).
>>
>> I would prefer to store it uncompressed if we have the unused space, so
>> that mc_grab can be easily used to get it.
> 
> If we need to compress it, we'll have to have a way to detect the
> compressed data.  It maybe sufficient to have a method to detect an
> uncompressed firmware image.  So, we check the image, if it isn't
> valid we try to decompress and then try again.
> 
> I concur, though, that we are best off not compressing firmware unless
> we have to.

Agreed.

> I have another concern, tho.  If we need to store more than one
> firmware image then we need to be able to determine which image goes
> into which NPE.  I don't think any of this is relevent for the NSLU2,
> but other targets are likely to have this issue.

I'm hoping that we can use mc_grab (or some similar tool) to grab the
correct microcode out of the payload area - each microcode has an ID
associated with it.

-- Rod


 
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