[lkml]   [2006]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [LinuxBIOS] [linux-usb-devel] [RFC][PATCH 0/2] x86_64 Early usb debug port support.
-----Original Message-----
[] On Behalf Of

>Ok due to popular demands here is the slightly fixed patch that works
>on both i386 and x86_64. For the i386 version you must not have
>HIGHMEM64G enabled.

>I just rolled it all into one patch as I'm to lazy to transmit all
>3 of them.

I got

Firmware type: LinuxBIOS
Linux version 2.6.19-smp-gc9976797-dirty (root@lbsrv) (gcc version
4.0.2) #196 6
Command line: earlyprintk=ttyS0,115200 apic=debug pci=noacpi,routeirq
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 0000000000001000 (reserved)
BIOS-e820: 0000000000001000 - 00000000000a0000 (usable)
BIOS-e820: 00000000000c0000 - 00000000000f0000 (usable)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000c0000000 (usable)
BIOS-e820: 0000000100000000 - 0000000240000000 (usable)
dbgp_num: 0
Found EHCI debug port
bar: 10 offset: 098
bar: 10 offset: 098
dbgp pre-set_fixmap_nocache
PANIC: early exception rip ffffffff809c24b4 error 0 cr2 ffff810000203ff8

Call Trace:
[<ffffffff809c24b4>] __set_fixmap+0x84/0x202
[<ffffffff809c05bb>] early_dbgp_init+0x259/0x55c
[<ffffffff8022d958>] __call_console_drivers+0x64/0x72
[<ffffffff809b242b>] do_early_param+0x0/0x57
[<ffffffff809c0a20>] setup_early_printk+0x162/0x17e
[<ffffffff809b2459>] do_early_param+0x2e/0x57
[<ffffffff8023d051>] parse_args+0x159/0x1f3
[<ffffffff809b24c2>] parse_early_param+0x40/0x4c
[<ffffffff809b88ca>] setup_arch+0x1c1/0x636
[<ffffffff809b2534>] start_kernel+0x55/0x208
[<ffffffff809b2173>] _sinittext+0x173/0x177

RIP __set_fixmap+0x84/0x202

With Greg's USB Debug, host and target can talk.
target with console=ttyUSB0,115200n8
host with cat /dev/ttyUSB0
But if use minicom in host, it will not show '\r', I guess the usb debug
cable eat return char. Greg, Can you add that back in usb_debug by
replacing '\n' with '\r', '\n'?

With Eric code in LinuxBIOS, it will report "No device found in debug


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-12-08 04:51    [W:0.047 / U:0.964 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site