net: ethernet: pcnet32: Setup the SRAM and NOUFLO on Am79C97{3, 5}

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commit 87f966d97b upstream.

On a MIPS Malta board, tons of fifo underflow errors have been observed
when using u-boot as bootloader instead of YAMON. The reason for that
is that YAMON used to set the pcnet device to SRAM mode but u-boot does
not. As a result, the default Tx threshold (64 bytes) is now too small to
keep the fifo relatively used and it can result to Tx fifo underflow errors.
As a result of which, it's best to setup the SRAM on supported controllers
so we can always use the NOUFLO bit.

Cc: <netdev@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>
Cc: Don Fry <pcnet32@frontier.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Markos Chandras 2015-03-19 10:28:14 +00:00 • committed by Greg Kroah-Hartman

parent 12c46a1ecb

commit d970996223

1 changed files with 29 additions and 2 deletions

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drivers/net/ethernet/amd/pcnet32.c

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