[U-Boot] [PATCH] net: fec: Avoid MX28 bus sync issue

[Robert Hodaszi]

I just brought up two samples, that it was a long-term problem. Now it 
is fixed. But if somebody is trying to compile the U-Boot with an older 
toolchain, it could cause problems. I had problems with 4.4.6.

Yes, 2k is a lot, and I would not put it on the stack. That was just a 
quick fix. It would be nicer to allocate the memory with malloc, and 
should do that at initialization time.

Best regards,
Robert Hodaszi

On 2013-09-12 16:05, Marek Vasut wrote:
> Dear Robert Hodaszi,
>
>> Hi,
>>
>> Sorry, hopefully that will be a plain-text.
>>
>> There are a lot of bug announcement, just make a search:
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33721
> This was apparently fixed three years ago.
>
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660
> And this one six years ago ...
>
>> Also, I printed out the buffer addresses, and that temporary RX buffer
>> was not aligned. So the transmit function rounded it down to the
>> alignment boundary, and so caused invalid data transmission. (By the
>> way. Shouldn't the transmit function check whether the alignment is
>> proper, and throw an error message, instead of round it down? That would
>> make more sense.)
> Looking at the code one more time, it'd make most sense to simply allocate the
> buffer NOT on stack, but with some memalign-kind-of call to avoid this abuse of
> stack. You see, the max packet size is around 2k, which is quite a lot. How does
> this proposal sound to you ?
>
> Best regards,
> Marek Vasut