All,
I have a 2.6.32 kernel based on the L23.i3.3 kernel (2.6.32) from TI,
and I've run into an interesting problem with UART3 (maps to /dev/ttyS1
on the Torpedo board).
On the host I have it hooked up to /dev/ttyS1, so I turn on CTS/RTS and
set the baudrate by:
host$ stty 115200 crtscts < /dev/ttyS1
And the same on the target:
OMAP-35x$ stty 115200 crtscts < /dev/ttyS1
To force the board to throttle the serial I slowed down the console to
19200:
OMAP-35x$ stty 19200 < /dev/ttyS0
On the target console I capture the data from the host (and show it on
the serial port):
OMAP-35x$ cat < /dev/ttyS1 | tee /tmp/x
and on the host send the data:
host$ dd if=/dev/urandom count=100 bs=1024 | hexdump -C > /tmp/x
host$ cat /tmp/x > /dev/ttyS1
I'd expect to see something like the following on the target:
00000000 35 2c a6 97 23 35 95 9a fb 91 6d 6e ce f8 32 d7
|5,..#5....mn..2.|
00000010 6b 0b cf 66 e6 3a b4 55 91 5f 86 8f 41 c9 49 76
|k..f.:.U._..A.Iv|
00000020 e6 cf fa 0a 0e db 69 0c db 14 6b 76 62 4c 5b 9e
|......i...kvbL[.|
00000030 98 1b 5f 30 16 d6 ed 96 dc d7 f1 3b 59 a0 ec ac
|.._0.......;Y...|
00000040 86 8c 9b 28 21 b8 a0 98 ed cf 96 39 15 a4 7b 9e
|...(!......9..{.|
00000050 bf 01 aa 09 1a 12 1f c3 49 b3 92 73 00 84 52 de
|........I..s..R.|
00000060 c0 d3 4b 1d ca 84 04 ea 60 ef 7f b2 63 36 eb 5e
|..K.....`...c6.^|
00000070 28 0c 20 2a 86 a2 36 bb c7 c0 27 da 87 c8 8b 1e |(.
*..6...'.....|
00000080 5d b7 04 b3 2c 0b 29 f4 8d 4f 5f fe 90 b0 1b 96
|]...,.)..O_.....|
00000090 b8 82 94 ae 92 37 31 03 dc 1b c3 c0 38 b1 16 77
|.....71.....8..w|
Instead I see:
OMAP-35x# head /tmp/x
00000000 35 2c a6 97 23 6b 0b ca fb 91 6d 6e ce f8 32 d6 8f
41.#5....mn..2.|
00000010 .Iv|
00f 66 e6 3a b4 55 91 5f 8669 0c c9 49 76
|k..f.:.U._..A.|.....000020 e6 cf
fa 0a 0e db 1b 5f db 14 6b 76 62 4c 5b 9e b 59 a.i...kvbL[.|
00000030 98.|
000030 16 d6 ed 96 dc d7 f1 3b 59 e0 ec ac
|.._0.......;Y.....(!..0040 86 8c
9b 28 21 b8 a0 98 09d cf 96 39 15 a4 7b 9e |.00 84 ....9..{.|
00000050 bf 01000000 1a 12 1f c3 49 b3 92 73 a 60 52 de
|........I..s..R.|
.....`60 c0 d3 4b 1d ca 84 04 e0 2a 8ef 7f b2 63 36 eb 5e |..7 c8
8b...c6.^|
00000070 28 0c 20000806 a2 36 bb c7 c0 27 da 87 8d 4f 1e |(.
*..6...'.....|
00.)..O_ 5d b7 04 b3 2c 0b 29 f4 ae 92 5f fe 90 b0 1b 96 |]...,.).6
7.....|
00000090 b8 82 94 00a0 37 31 03 dc 1b c3 c0 38 b1 7c 77
|.....71.....8..w|
Looking deeper:
OMAP-35x# hexdump -C /tmp/x | head
00000000 30 30 30 30 30 30 30 30 20 20 33 35 20 32 63 20 |00000000
35 2c |
00000010 61 36 20 39 37 20 32 33 20 36 62 20 30 62 20 63 |a6 97 23 6b
0b c|
00000020 61 20 20 66 62 20 39 31 20 36 64 20 36 65 20 63 |a fb 91 6d
6e c|
00000030 65 20 66 38 20 33 32 20 64 36 20 38 66 20 34 31 |e f8 32 d6
8f 41|
00000040 2e 23 35 2e 2e 2e 2e 6d 6e 2e 2e 32 2e 7c 0a 30
|.#5....mn..2.|.0|
00000050 30 30 30 30 30 31 30 20 20 2e 49 76 7c 0a 30 30 |0000010
.Iv|.00|
00000060 66 20 36 36 20 65 36 20 33 61 20 62 34 20 35 35 |f 66 e6 3a
b4 55|
00000070 20 20 39 31 20 35 66 20 38 36 36 39 20 30 63 20 | 91 5f
8669 0c |
00000080 20 63 39 20 34 39 20 37 36 20 20 7c 6b 2e 2e 66 | c9 49 76
|k..f|
00000090 2e 3a 2e 55 2e 5f 2e 2e 41 2e 7c 2e 2e 2e 2e 2e
|.:.U._..A.|.....|
However if I instead use UART2 and replicate the above steps, all is
well. I've looked at the serial signals and CTS/RTS are responding as
expected. I tried switching drivers from the 8250 to the OMAP_SERIAL,
and the results look the same.
Any ideas what is happening?
--
Peter Barada
peterb@xxxxxxxxxxx
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