Thanks for reply and help. I attached an Ajays NET20DC to the USB port.
It seems not help here.
Below is the dmesg and lsusb output.
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.12.8 #2 SMP Tue Feb 18 06:09:46 CST 2014
x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
|__ Port 2: Dev 3, If 0, Class=Vendor Specific Class,
Driver=usb_debug, 480M
|__ Port 4: Dev 4, If 0, Class=Human Interface Device,
Driver=usbhid, 12M
|__ Port 4: Dev 4, If 1, Class=Human Interface Device,
Driver=usbhid, 12M
|__ Port 7: Dev 5, If 0, Class=Human Interface Device,
Driver=usbhid, 1.5M
|__ Port 7: Dev 5, If 1, Class=Human Interface Device,
Driver=usbhid, 1.5M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 4: Dev 3, If 0, Class=Vendor Specific Class,
Driver=usb_debug, 480M
[root@localhost ~]# dmesg
... ...
[ 0.000000] Found EHCI debug port on 00:1a.0
[ 0.000000] bar: 10 offset: 0a0
[ 0.000000] bar_val: d0c20000 offset: 0a0
[ 0.000000] ehci_bar: ffffffffff5fb000
[ 0.000000] dbgp: ehci BIOS state 00010001
[ 0.000000] dbgp: BIOS handoff
[ 0.000000] debug_port: 2
[ 0.000000] n_ports: 2
[ 0.000000] dbgp:
[ 0.000000] Debug control: 00000000 ehci cmd : 00080000 ehci
conf flg: 00000000
[ 0.000000] ehci status : 00001000 ehci portsc : 00003000
[ 0.000000] portstatus1: 00003000
[ 0.000000] portstatus2: 00003000
[ 0.000000] dbgp: ehci reset done
[ 0.000000] Debug control: 00000000 ehci cmd : 00080000 ehci
conf flg: 00000000
[ 0.000000] ehci status : 00001000 ehci portsc : 00003000
[ 0.000000] dbgp: EHCI startup
[ 0.000000] Debug control: 40000000 ehci cmd : 00080000 ehci
conf flg: 00000000
[ 0.000000] ehci status : 00001000 ehci portsc : 00003000
[ 0.000000] ehci can not be started
[ 0.000000] ehci_setup failed
[ 0.000000] Malformed early option 'kgdbdbgp'
... ...
It fails in dbgp_ehci_startup().
Thanks,
Allen
On 2/19/2014 1:01 AM, Felipe Balbi wrote:
On Tue, Feb 18, 2014 at 09:01:29AM -0800, Greg KH wrote:
On Tue, Feb 18, 2014 at 02:46:00PM +0800, Lu, Baolu wrote:
Hi list,
Linux kernel (3.12.8) fails to setup EHCI debug port on my Sandy Bridge
server. This seems to be a normal thing as I tried on other machines and got
the same result.
Do you have a EHCI debug connector to attach to it? That is required in
you can make one, if you wish:
http://www.coreboot.org/DIY_EHCI_debug_dongle
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