linux-kernel - Re: [PATCH] serial: 8250: Default SERIAL_OF_PLATFORM to SERIAL

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Date:   Mon, 19 Nov 2018 10:44:30 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     arnd@...db.de, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250: Default SERIAL_OF_PLATFORM to SERIAL_8250

On 11/15/18 5:16 PM, Guenter Roeck wrote:
> On Thu, Nov 15, 2018 at 11:48:20AM -0800, Florian Fainelli wrote:
>>
>> OK, would you mind testing this below? It seems to me that 8250_of.c is
>> incompatible with arch/powerpc/kernel/legacy_serial.c and that is what
>> is causing the issue here.
>>
>> diff --git a/drivers/tty/serial/8250/Kconfig
>> b/drivers/tty/serial/8250/Kconfig
>> index d7737dca0e48..21cb14cbd34a 100644
>> --- a/drivers/tty/serial/8250/Kconfig
>> +++ b/drivers/tty/serial/8250/Kconfig
>> @@ -483,7 +483,7 @@ config SERIAL_8250_PXA
>>
>>  config SERIAL_OF_PLATFORM
>>         tristate "Devicetree based probing for 8250 ports"
>> -       depends on SERIAL_8250 && OF
>> +       depends on SERIAL_8250 && OF && !(PPC && PPC_UDBG_16550)
>>         default SERIAL_8250
>>         help
>>           This option is used for all 8250 compatible serial ports that
> 
> 44x/virtex5_defconfig has both PPC_UDBG_16550 and SERIAL_OF_PLATFORM enabled
> and fails to boot (or display anything on the console) with this patch applied.

Thanks for trying, can you either share or provide a link to the mpc85xx
and ml507 qemu command lines that you use? I spent a good chunk of my
time trying to get a kernel to boot but has failed so far.

Thanks
-- 
Florian