Hi Cheng,

On 25.07.2016 04:33, cheng yichen 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.

Can you confirm that you see the full coreboot log on your UART? With
log level >= debug, it should end with lines about loading the payload,
containing a line starting with "Jumping to boot code at".

If you see this line, it's unlikely to be a coreboot issue. If not,
please provide a full log with highest log level. Also the output of
`lspci -xxx`, `cbmem -c` and your devicetree.cb might be helpful.

Another way to test the UART is to use Linux' earlycon driver, e.g. with
earlycon=uart8250,io,0x3f8,115200n8 in your kernel command line. This
driver is simpler than the serial8250 (it doesn't use interrupts and is
closer to what coreboot's driver does).

Nico

>
>
>
> 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@gmail.com>:
>
>> On Fri, Jul 22, 2016 at 1:14 PM, cheng yichen <blessyichen@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
>>
>
>
>