Re: Serial issues with EG20T (Topcliff) PCH uarts
From: Darren Hart
Date: Wed Sep 28 2011 - 13:51:58 EST
Hi Alan,
Thanks for the suggestions. Still not working, details follow.
On 09/27/2011 02:57 PM, Alan Cox wrote:
>> Using the ti_usb_3410_5052 driver with modified vendor/product strings, I am
>> able to get ttyUSB0 on my host and open it in minicom:
>>
>> $ sudo modprobe ti_usb_3410_5052 vendor_3410=0x0451 product_3410=0x5053
>> $ minicom -D /dev/ttyUSB0
>
> Please submit those idents to GregKH for the ti_usb driver.
>
I will. I need to confirm this is something I can do now (if I can use
the product name, etc.).
>> Can anyone offer up some ideas on what I might try to get:
>>
>> 1) the getty working
>> 2) the earlier kernel messages to appear
>> 3) syslinux working
>>
>> over the serial port?
>
> It may depend a lot on the port. If it boots in PCI D3 (power saved) then
> it's going to be fun. Otherwise forcing the address of the port ought to
> do the trick.
>
> See
> console=uart8250,io 0xb060,115200n8
I tried:
console=uart8250,io,0xb060,115200n8
With this I got 4 non-ascii chars
>
> although it's polled so you may want to drop the speed a bit!
I switched all my terminal emulators, syslinux config, the getty, and
console redirection in the bios to use 9600n8. Then ran with:
console=uart8250,io,0xb060,9600n8
This printed several bursts of garbled non-ascii strings, but did so
very early! :)
With minicom on each end, I see the INT 18 count go up by 1 for every
char sent from the board and up by 3 for every char sent from my dev
box, as well as the irregular rx,fe increment mentioned originally.
>
> netconsole might also be useful to debug the early serial problems !
I did give that a shot, it complained about eth0 not existing, despite
the driver being compiled in. Possibly an init race with netconsole and
pch_gbe? Similar posts sent to linux-next earlier this year.
>
> No idea for syslinux.
Doesn't like 9600 either.
>
> Alan
So I'm bugging the hardware/firmware guys, really looks like something
is bad under the covers to me.
Thanks Alan!
--
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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