Re: [microblaze-uclinux] EMAC DRE and CSO support in 2.6 kernel?

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Jim,

John Williams wrote:

> > Um, what happened to the hardware checksum (CheckSum Offload) and data 
> > realignment engine (DRE) support that was in the 2.4 kernel in 
> > uClinux-2.4.x/drivers/net/xilinx_enet?  I don't see any references to 
> > that in linux-2.6.x-petalogix/drivers/net/xilinx_emac even though (I 
> > think) the xilinx source hasn't changed.  With 2.6, enabling either rx 
> > or tx CSO causes rx to fail, and enabling DRE make u-boot behave 
> > badly.  Did those features move somewhere else in the kernel or are 
> > they no longer supported/haven't been ported yet?
>
>
> Haven't been ported yet.  Ask LynuxWorks, they did the driver ports.

This came out wrong - I'm not having a go at you!

> It's worth checking the status of the unofficial PPC trees, see if 
> they've got this stuff in their drivers yet, and we can bring it across.

It should be possible to bring the 2.4 driver (with DRE etc) across to 
2.6 with minimal mods - there's a legacy ethernet driver framework that 
supports the old style net drivers.

Doing device drivers properly is an expensive and time consuming 
business - we don't get any development support from Xilinx for this so 
we have to make do with what we get from their other Linux vendors.

Cheers,

John
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