[coreboot] w83627 uart port is not workable with coreboot in linux

Zoran Stojsavljevic zoran.stojsavljevic at gmail.com
Mon Jul 25 07:57:07 CEST 2016


Hello Chen,

I see. Also learning, reading and trying to get to the root of the problem.

> [    1.637664] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is
a 16550A
> [    1.658835] serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud =
115200) is a 16550A

Please, try to experiment with ttyS1. But I guess, you already know what I
just wrote. Maybe this also can help:
http://forums.debian.net/viewtopic.php?f=7&t=111355

Zoran

On Mon, Jul 25, 2016 at 7:08 AM, cheng yichen <blessyichen at gmail.com> wrote:

> Hi Zoran
>
> The ttyS0 is superIo uart. Because I add uart asl code in coreboot system
> will show "00:05: ttyS0"
> If I remove asl code system will show "serial8250:ttty"    Thank you
>
> 2016-07-25 12:10 GMT+08:00 Zoran Stojsavljevic <
> zoran.stojsavljevic at gmail.com>:
>
>> > home# dmesg | grep -i tty
>> > [    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic
>> root=UUID=b2b7f7fa-b1db-4e97-
>> > 941f-8aaee291f3dc ro console=tty1 console=ttyS0,115200n8 quiet splash
>> vt.handoff=7
>> > [    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic
>> root=UUID=b2b7f7fa-b1db-
>> > 4e97-941f-8aaee291f3dc ro console=tty1 console=ttyS0,115200n8 quiet
>> splash vt.handoff=7
>> > [    0.000000] console [tty1] enabled
>> > [    0.000000] console [ttyS0] enabled
>> > [    1.637664] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200)
>> is a 16550A
>> > [    1.658835] serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud =
>> 115200) is a 16550A
>> > [    3.412478] fbcon: Remapping primary device, fb1, to tty 1-63
>> > [   44.378835] systemd[1]: Created slice system-serial\x2dgetty.slice.
>> > [   44.380198] systemd[1]: Created slice system-getty.slice.
>> _______
>>
>> Hello Cheng,
>>
>> Please, try to do the following: lspci -vv (to find your serial on PCIe),
>> then try to remap your IRQs, to see if this will somehow work.
>>
>> Example:
>> setserial /dev/ttyS0 port 0xd800 UART 16550A irq 5
>> setserial /dev/ttyS0 -av
>> /dev/ttyS0, Line 0, UART: 16550A, Port: 0xd800, IRQ: 5
>>         Baud_base: 115200, close_delay: 5000, divisor: 0
>>         closing_wait: 37856
>>         Flags: spd_normal skip_test
>>
>> Something like described on this web pointer:
>> https://forums.gentoo.org/viewtopic-t-249041-start-0.html
>>
>> Please, report your attempts/results here.
>>
>> Thank you,
>> Zoran
>>
>> On Mon, Jul 25, 2016 at 4:33 AM, cheng yichen <blessyichen at gmail.com>
>> wrote:
>>
>>> Hi all
>>>
>>> After i follow kontron/ktqm77 setting. I can't solve the issue.
>>> I try to change iqr(for com1) to 5 or 6. but system can't print linux
>>> message and minicom is not workable.
>>>
>>>
>>>
>>> dump from superiotool
>>> Found Winbond W83627DHG-P/-PT (id=0xb0, rev=0x73) at 0x2e
>>> Register dump:
>>> idx 02 20 21 22 23 24 25 26  27 28 29 2a 2b 2c 2d 2e  2f
>>> val ff b0 73 ff 00 42 00 00  ff 50 80 00 00 eb 21 00  ff
>>> def 00 b0 NA ff 00 MM 00 MM  RR 50 00 00 RR e2 21 00  00
>>> LDN 0x00 (Floppy)
>>> idx 30 60 61 70 74 f0 f1 f2  f4 f5
>>> val 01 03 f0 06 02 8e 00 ff  00 00
>>> def 01 03 f0 06 02 8e 00 ff  00 00
>>> LDN 0x01 (Parallel port)
>>> idx 30 60 61 70 74 f0
>>> val 01 03 78 07 04 3f
>>> def 01 03 78 07 04 3f
>>> LDN 0x02 (COM1)
>>> idx 30 60 61 70 f0
>>> val 01 03 f8 04 40
>>> def 01 03 f8 04 00
>>> LDN 0x03 (COM2)
>>> idx 30 60 61 70 f0 f1
>>> val 01 02 f8 03 40 00
>>> def 01 02 f8 03 00 00
>>> LDN 0x05 (Keyboard)
>>>
>>>
>>> dump from dmesg
>>>
>>> home# dmesg | grep -i tty
>>> [    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic
>>> root=UUID=b2b7f7fa-b1db-4e97-941f-8aaee291f3dc ro console=tty1
>>> console=ttyS0,115200n8 quiet splash vt.handoff=7
>>> [    0.000000] Kernel command line:
>>> BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic
>>> root=UUID=b2b7f7fa-b1db-4e97-941f-8aaee291f3dc ro console=tty1
>>> console=ttyS0,115200n8 quiet splash vt.handoff=7
>>> [    0.000000] console [tty1] enabled
>>> [    0.000000] console [ttyS0] enabled
>>> [    1.637664] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200)
>>> is a 16550A
>>> [    1.658835] serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud =
>>> 115200) is a 16550A
>>> [    3.412478] fbcon: Remapping primary device, fb1, to tty 1-63
>>> [   44.378835] systemd[1]: Created slice system-serial\x2dgetty.slice.
>>> [   44.380198] systemd[1]: Created slice system-getty.slice.
>>>
>>>
>>>
>>>
>>>
>>> 2016-07-22 20:24 GMT+08:00 Kyösti Mälkki <kyosti.malkki at gmail.com>:
>>>
>>>> On Fri, Jul 22, 2016 at 1:14 PM, cheng yichen <blessyichen at gmail.com>
>>>> wrote:
>>>> > Hi all
>>>> >
>>>> > My platform is braswell SOC with W83627dhg superIO. In post stage I
>>>> can get
>>>> > debug message over w83627 uart1(3f8/irq4). but after boot to linux,
>>>> uart
>>>> > port is not woarkable. I test the function by minicom but I can't
>>>> receive
>>>> > and send data. I can get uart information by dmesg command.
>>>> > How to initial it in corebooot?
>>>>
>>>> Does not sound like a coreboot issue to me.
>>>>
>>>> Do you have CTS/RTS hardware handshake disabled in minicom
>>>> configuration? If you directed kernel console to serial port, you
>>>> should not (cannot) use the port for user apps.
>>>>
>>>> HTH,
>>>> Kyösti
>>>>
>>>
>>>
>>> --
>>> coreboot mailing list: coreboot at coreboot.org
>>> https://www.coreboot.org/mailman/listinfo/coreboot
>>>
>>
>>
>
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