2011/10/24, Giuseppe CAVALLARO <peppe.cavallaro@xxxxxx>: > Hello Kelvin. > > On 10/24/2011 12:36 PM, Kelvin Cheung wrote: > > [snip] > >> According to datasheet of Loongson 1B, the buffer size in RX/TX >> descriptor is only 2KB. So the Loongson1B's GMAC could not handle >> jumbo frames. And the second buffer is useless in this case. Am I >> right? Is there a better way than ifdef CONFIG_MACH_LOONGSON1 to >> avoid duplicate code? > > Sorry for my misunderstanding. > > I think you have to use the normal descriptor and remove the enh_desc > from the platform w/o modifying the driver at all. > > The driver will be able to select/configure all automatically (also jumbo). > > Let me know. That's the problem. The bitfield definition of Loongson1B is also different from normal descriptor. Moreover, I want to enable the TX checksum offload function which is not supported in normal descriptor. Any suggestions? > Note: > IIRC, there is a bit difference in case of normal descriptors for > Synopsys databook newer than the 1.91 (I used for testing this mode). > In any case, I remember that, on some platforms, the normal descriptors > have been used w/o problems also on these new chip generations. > > Peppe > > -- Best Regards! Kelvin
