Made some more progress on this. Having instrumented parport_pc.c in detail,
now I see much more:
First, we have jumpered our TS-SER2 for 0x378 and IRQ 7, and entered various
options attempting to get things working into /etc/modprobe.d/parport.conf.
And again we have stock 2.6.29-ts with gnueabi-gcc-3.4.4, with the only mod to
the stock build being addition of the parallel support:
CONFIG_PARPORT=m
CONFIG_PARPORT_PC=m
# CONFIG_PARPORT_PC_FIFO is not set
# CONFIG_PARPORT_PC_SUPERIO is not set
# CONFIG_PARPORT_GSC is not set
CONFIG_PARPORT_AX88796=m
CONFIG_PARPORT_1284=y
CONFIG_PARPORT_NOT_PC=y
# CONFIG_I2C_PARPORT is not set
# CONFIG_I2C_PARPORT_LIGHT is not set
Lessons learned and questions.
1. Do not enable the superio option: CONFIG_PARPORT_PC_SUPERIO! This is
experimental code and it segfaults superio os irrelevant for TS boards anyway.
2. There is no evidence of parport_pc ever having been ported to ARM. For
example, it has hexadecimally hard coded Intel port addresses such as this very
important statement found at line 2235:
if (base != 0x3bc) {
According to everything I have read from TS and this group, we must use the
address 0x11e03bc, etc. as the port address
3. The driver gives a segmentation fault when executing this emulated statement
at line 1694 of parport_pc.c:
outb (r, CONTROL (pb));
which nets us:
Jan 21 19:34:38 cmn899 kernel: Unable to handle kernel paging request at
virtual address 11e0037a
This line shows that our port address assignment, which we did via
/etc/modprobe.d/parport.conf succeeded. But the kernel is not happy with our
attempt to access this address. The rest of the kernel complaints are below.
What do I need to do to get the kernel to allow me to access those addresses?
Am I on the right track? Thanks a lot! The folks at TS told my buyer that it
"should" work on ARM. I am dubious now, but no matter, we must push forward
anyway. Thanks again!
- Clark
Jan 21 19:34:38 cmn899 kernel: Unable to handle kernel paging request at
virtual address 11e0037a
Jan 21 19:34:38 cmn899 kernel: pgd = cc1ac000
Jan 21 19:34:38 cmn899 kernel: [11e0037a] *pgd=00000000
Jan 21 19:34:38 cmn899 kernel: Internal error: Oops: 805 [#1] PREEMPT
Jan 21 19:34:38 cmn899 kernel: Modules linked in: parport_pc(+) parport usbhid
hid zd1201 firmware_class ext3 jbd vfat fat usb_storage sd_mod scsi_mod evdev
input_core ohci_hcd rtc_ep93xx usbcore 8250 tssdcard
Jan 21 19:34:38 cmn899 kernel: CPU: 0 Not tainted (2.6.29-ts #12)
Jan 21 19:34:38 cmn899 kernel: PC is at parport_pc_probe_port+0x1d8/0x9ac
[parport_pc]
Jan 21 19:34:38 cmn899 kernel: LR is at vprintk+0x30c/0x378
Jan 21 19:34:38 cmn899 kernel: pc : [<bf126f6c>] lr : [<c0045d08>] psr:
60000013
Jan 21 19:34:38 cmn899 kernel: sp : cc64fc88 ip : cc64fbf8 fp : cc64fcdc
Jan 21 19:34:38 cmn899 kernel: r10: 11e00378 r9 : 0000000c r8 : 00000000
Jan 21 19:34:38 cmn899 kernel: r7 : cc6fb5a8 r6 : cd4e8728 r5 : cc6fb5a8 r4
: c03086c8
Jan 21 19:34:38 cmn899 kernel: r3 : 11e00378 r2 : cc64e000 r1 : c02da420 r0
: 00000020
Jan 21 19:34:38 cmn899 kernel: Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA
ARM Segment user
Jan 21 19:34:38 cmn899 kernel: Control: c000717f Table: e41ac000 DAC: 00000015
Jan 21 19:34:38 cmn899 kernel: Process modprobe (pid: 899, stack limit =
0xcc64e268)
Jan 21 19:34:38 cmn899 kernel: Stack: (0xcc64fc88 to 0xcc650000)
Jan 21 19:34:38 cmn899 kernel: fc80: 00000000 00000000
cc64e000 cc6fb5c8 cc0dde40 cc5f88e0
Jan 21 19:34:38 cmn899 kernel: fca0: 00000000 cc1c58a0 ffffffff 11e00778
cc64fccc 00000001 bf12c404 bf12c404
Jan 21 19:34:38 cmn899 kernel: fcc0: 11e00378 bf12c134 cc64e000 00000000
cc64fd0c cc64fce0 bf12c2ec bf126da4
Jan 21 19:34:38 cmn899 kernel: fce0: 00000000 d84156c5 cc64fd34 00000007
00004a1f bf12955c 00000000 cc64e000
Jan 21 19:34:38 cmn899 kernel: fd00: cc64ff7c cc64fd10 c0025308 bf12c144
00000000 00000780 0000000f 00000000
Jan 21 19:34:38 cmn899 kernel: fd20: cc64fd6c cc64fd30 c0093940 c0093208
cc64fd6c cc64fd40 c0093434 c0092e88
Jan 21 19:34:38 cmn899 kernel: fd40: cc64fd6c cd409524 cd4071e0 cd408900
cd409500 cd4071e0 c03283e0 00000010
Jan 21 19:34:38 cmn899 kernel: fd60: cc64fd84 cc64fda0 ffffffff 00000001
c0093434 cd4048e0 00000001 c0308ae4
Jan 21 19:34:38 cmn899 kernel: fd80: c0475524 c00ddd04 c031e228 c03092e0
cc64fdbc cc64fda0 c0268ab0 c0062630
Jan 21 19:34:38 cmn899 kernel: fda0: 00000000 cd5afe30 cc64fe28 cd5b8fc8
cc64fdcc cc64fdc0 c0268b24 c0268a08
Jan 21 19:34:38 cmn899 kernel: fdc0: cc64fe24 cc64fdd0 c00dde74 c0268b24
c00de0d0 c015fd68 cc64fe04 cc64fde8
Jan 21 19:34:38 cmn899 kernel: fde0: c0093220 c0093238 00000000 000004b0
00000032 d84156c5 cc64fe44 cc64fe08
Jan 21 19:34:38 cmn899 kernel: fe00: c0093940 c0093208 00000001 c041df60
c031c484 c008dd68 cc64fe4c cd4001c0
Jan 21 19:34:38 cmn899 kernel: fe20: cd405df0 cd557c20 a0000013 c008dd68
ce1f4000 00000000 cc64fe6c cc64fe48
Jan 21 19:34:38 cmn899 kernel: fe40: c00945c4 c00936b4 c00749e0 00000005
cd557c20 00000000 00000001 ce1f68e4
Jan 21 19:34:38 cmn899 kernel: fe60: cc64fe8c cc64fe70 c008dd68 c0094518
0000001c cd5b8d88 bf12955c 0000001c
Jan 21 19:34:38 cmn899 kernel: fe80: cc64fe9c cc64fe90 c008ddbc c008dca4
cc64ff7c cc64fea0 c00683d4 c008dd94
Jan 21 19:34:38 cmn899 kernel: fea0: 00000000 cc64ff08 08100077 00000438
cc66b2d0 c026c424 c026c424 0000001c
Jan 21 19:34:38 cmn899 kernel: fec0: 00000ba0 00000bb8 c004ad6c bf128b28
00000000 000000bb 000000bb 0000006c
Jan 21 19:34:38 cmn899 kernel: fee0: 00000068 00000050 cc64e000 0000000a
00000014 0000001b 0000001a ce1f805c
Jan 21 19:34:38 cmn899 kernel: ff00: cd557248 ce1f67f0 00000000 00000000
60000013 00000004 00000000 00000000
Jan 21 19:34:38 cmn899 kernel: ff20: 00000268 00000040 00000000 00000000
00000000 00000000 c031e228 c03059a4
Jan 21 19:34:38 cmn899 kernel: ff40: cc64ff6c 00004a1f bf12955c 00000000
00000000 00004a1f bf12955c 00000000
Jan 21 19:34:38 cmn899 kernel: ff60: 00000000 c0026088 cc64e000 00000000
cc64ffa4 cc64ff80 c0068514 c00252b0
Jan 21 19:34:38 cmn899 kernel: ff80: 00000000 00008edc 00009064 00000000
00008edc 00000080 00000000 cc64ffa8
Jan 21 19:34:38 cmn899 kernel: ffa0: c0025ee0 c006847c 00009064 00000000
4014d000 00004a1f 0001d570 00004a1f
Jan 21 19:34:38 cmn899 kernel: ffc0: 00009064 00000000 00008edc 00000080
00000000 00000000 40025000 bef39984
Jan 21 19:34:38 cmn899 kernel: ffe0: 00000000 bef398fc 0000b6b0 400e8f34
60000010 4014d000 00000000 00000000
Jan 21 19:34:38 cmn899 kernel: Backtrace:
Jan 21 19:34:38 cmn899 kernel: [<bf126d94>] (parport_pc_probe_port+0x0/0x9ac
[parport_pc]) from [<bf12c2ec>] (parport_pc_init+0x1b8/0x28c [parport_pc])
Jan 21 19:34:38 cmn899 kernel: [<bf12c134>] (parport_pc_init+0x0/0x28c
[parport_pc]) from [<c0025308>] (do_one_initcall+0x68/0x1b0)
Jan 21 19:34:38 cmn899 kernel: r7:cc64e000 r6:00000000 r5:bf12955c r4:00004a1f
Jan 21 19:34:38 cmn899 kernel: [<c00252a0>] (do_one_initcall+0x0/0x1b0) from
[<c0068514>] (sys_init_module+0xa8/0x1ac)
Jan 21 19:34:38 cmn899 kernel: [<c006846c>] (sys_init_module+0x0/0x1ac) from
[<c0025ee0>] (ret_fast_syscall+0x0/0x2c)
Jan 21 19:34:38 cmn899 kernel: r7:00000080 r6:00008edc r5:00000000 r4:00009064
Jan 21 19:34:38 cmn899 kernel: Code: e1a01006 e59650f4 eb3c7b82 e5963000
(e5c39002)
Jan 21 19:34:38 cmn899 kernel: ---[ end trace 5421d086b0d5a7f3 ]---
------------------------------------
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