Hello,
I am using debian(3.8.13xenomai-bone28) on Beaglebone Black. I got some errors in loading the xeno_16550A real time serial port driver on Beaglebone Black.
dmesg>grep tty
[ 0.000000] Kernel command line: console=ttyO0,115200n8 capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART5,BB-SPIDEV0,BB-SPIDEV1,BB-CANBUS1 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait fixrtc ip=
[ 0.880381] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88) is a OMAP UART0
[ 1.689899] console [ttyO0] enabled
[ 2.583705] 48022000.serial: ttyO1 at MMIO 0x48022000 (irq = 89) is a OMAP UART1
[ 2.700468] 48024000.serial: ttyO2 at MMIO 0x48024000 (irq = 90) is a OMAP UART2
[ 2.824139] 481aa000.serial: ttyO5 at MMIO 0x481aa000 (irq = 62) is a OMAP UART5
According to the information above, uart2’s mmio is 0x48024000 and irq = 90.
From other documentations, I found this definition:
Pin Name DT Offset
UART2_TXD 0x154
UART2_RXD 0x150
Then I execute some commands below according to http://www.xenomai.org/index.php/16550A, but it dosen’t work!
setserial /dev/ttyO2
/dev/ttyO2, UART: undefined, Port: 0x0000, IRQ: 90
setserial /dev/ttyO2 uart none
Cannot set serial info: Invalid argument
/sbin/modprobe xeno_16550A io=0x150 irq=90 start_index=0 baud_base=115200
ERROR: could not insert ‘xeno_16550A’: Device or resource busy
/sbin/modprobe xeno_16550A mem=0x48024000 irq=90 baud_base=115200
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.027662] Internal error: : 1028 [#1] SMP ARM
Segmentation fault
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.100983] Process modprobe (pid: 2084, stack limit = 0xdf2a0240)
root@arm:/home/debian#
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.107432] Stack: (0xdf2a1e40 to 0xdf2a2000)
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.111989] 1e40: bf025000 00000000 00000000 bf0228e8 df2a1f58 00000000 00000001 bf022930
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.120530] 1e60: 00000000 bf025000 0000001c c0008998 bf025000 00000000 00000001 bf0228e8
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.129073] 1e80: bf0228e8 df2a1f58 00000000 00000001 bf022930 00000001 de4edcc0 c008b148
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.137613] 1ea0: bf0228f4 00007fff c008703c c015f438 c0088638 00000028 00000000 bf0228f4
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.146155] 1ec0: bf022a3c 00000116 c06a64b4 e09dd2b8 df2a1eec b6f872d0 ffffffff c0921db4
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.154695] 1ee0: 5f5f0065 c069b0d8 e09df000 b6d8d000 00000379 00000000 00000000 00000000
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.163233] 1f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.171774] 1f20: 00000000 00000000 00000000 00000000 000000d2 b6d87000 000063f9 b6f872d0
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.180314] 1f40: 00000080 c000dd08 df2a0000 00000000 00000000 c008b4c4 e09d9000 000063f9
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.188854] 1f60: e09dcde0 e09dcca9 e09ded00 00002b34 00003684 00000000 00000000 00000000
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.197394] 1f80: 0000001f 00000020 00000014 00000018 0000000c 00000000 00000000 b6f87308
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.205936] 1fa0: b6f87268 c000db40 00000000 b6f87308 b6d87000 000063f9 b6f872d0 00000002
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.214477] 1fc0: 00000000 b6f87308 b6f87268 00000080 00000000 b6f872d0 000063f9 00000000
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.223018] 1fe0: 00040000 bec683c4 b6f3eb07 b6ec1d94 80000010 b6d87000 00000000 00000000
Message from syslogd@arm at Sep 27 01:45:52 …
kernel:[ 145.282094] Code: 1a000002 e5d03000 e6ef0073 ea000001 (e7d20001)
Regards,
Ricky Qs