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Reconfiguring the UART when the FIFO is not empty may cause the boot to
hang. This hang is extremely suspectible to timing differences; recompiling
the kernel with the same configuration, but different UTS_VERSION
timestamps can yield images that hang more or less often. Sometimes images
are produced that hang reproducibly.
This patch should also make it into one of the next linux-stable releases,
but it's better to get this fixed as soon as possible.
Fixes #21773, #21857.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Backport of r49156
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@49202 3c298f89-4303-0410-b956-a3cf2f4a3e73
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