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* [PATCH] ARM: imx_v7_defconfig: Limit TFTP window size
@ 2022-09-13  9:05 Sascha Hauer
  0 siblings, 0 replies; only message in thread
From: Sascha Hauer @ 2022-09-13  9:05 UTC (permalink / raw)
  To: Barebox List; +Cc: Enrico Scholz

The FEC ethernet controller is too slow to catch up with a gigabit
link. This hasn't been a problem until now, because the protocols
we use in barebox only have a single packet in flight. With TFTP
window size support and a gigabit link though we get receive
buffer overruns resulting in messages like:

WARNING: eth0: error frame: 0x2feca098 0x00000806

The resulting speed is slower than without TFTP windowsize support due
to the necessary retransmits. Limit the window size to a value that
seems to be working on i.MX6 boards.

Signed-off-by: Sascha Hauer <>
 arch/arm/configs/imx_v7_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/imx_v7_defconfig b/arch/arm/configs/imx_v7_defconfig
index df2304eae9..d07abe28ae 100644
--- a/arch/arm/configs/imx_v7_defconfig
+++ b/arch/arm/configs/imx_v7_defconfig
@@ -210,6 +210,7 @@ CONFIG_GENERIC_PHY=y

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2022-09-13  9:05 [PATCH] ARM: imx_v7_defconfig: Limit TFTP window size Sascha Hauer

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