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

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Date:   Fri, 23 Nov 2018 10:20:23 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Florian Fainelli <f.fainelli@...il.com>
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 Mon, Nov 19, 2018 at 12:50:50PM -0800, Guenter Roeck wrote:
> On Mon, Nov 19, 2018 at 10:44:30AM -0800, Florian Fainelli wrote:
> > 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.
> > 
> 

Any update ? I still see the boot failures in next-20181123.

Guenter

> Good to hear that this doesn't just happen to me ;-).
> 
> The scripts are all at https://github.com/groeck/linux-build-test/.
> This includes root file systems. The one used below is at
> https://github.com/groeck/linux-build-test/blob/master/rootfs/ppc/rootfs.cpio.gz
> 
> ml507:
> 
> qemu-system-ppc -kernel vmlinux -M virtex-ml507 -m 256 -no-reboot \
> 	-initrd rootfs.cpio -dtb arch/powerpc/boot/dts/virtex440-ml507.dtb \
> 	--append 'rdinit=/sbin/init panic=-1 mem=256M console=ttyS0' \
> 	-monitor none -nographic
> 
> mpc85xx:
> 
> qemu-system-ppc -kernel arch/powerpc/boot/uImage -M mpc8544ds -m 256 \
> 	-no-reboot -initrd rootfs.cpio \
> 	--append 'rdinit=/sbin/init panic=-1 mem=256M console=ttyS0' \
> 	-monitor none -nographic
> 
> Hope this helps,
> Guenter