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net: fec_mxc: Fix timeouts during tftp transfer

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Performing tftp transfers on mx28 results in random timeouts.

Hector Palacios and Robert Hodaszi analyzed the root cause being related to the
wrong alignment of the 'buff' buffer inside fec_recv().

Benoît Thébaudeau provided an excellent analysis of the alignment bug that is
present on older versions, such as GCC 4.5.4:

http://marc.info/?l=u-boot&m=137942904906131&w=2

Use ALLOC_CACHE_ALIGN_BUFFER() to avoid alignment issues from older GCC
versions.

Reported-by: Hector Palacios <hector.palacios@digi.com>
Tested-by: Oliver Metz <oliver@freetz.org>
Tested-by: Hector Palacios <hector.palacios@digi.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Tested-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Fabio Estevam 2013-09-17 23:13:10 -03:00 • committed by Stefano Babic
parent 1d58524126
commit fd37f195ca
1 changed files with 1 additions and 1 deletions
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2
drivers/net/fec_mxc.c
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@ -794,7 +794,7 @@ static int fec_recv(struct eth_device *dev)
uint16_t bd_status;
uint32_t addr, size, end;
int i;
uchar buff[FEC_MAX_PKT_SIZE] __aligned(ARCH_DMA_MINALIGN);
ALLOC_CACHE_ALIGN_BUFFER(uchar, buff, FEC_MAX_PKT_SIZE);
/*
* Check if any critical events have happened