Linux 4.7 and Jornada 720 (SA-1100)
Russell King - ARM Linux
linux at armlinux.org.uk
Fri Aug 19 06:26:50 PDT 2016
On Fri, Aug 19, 2016 at 01:11:13PM +0000, Adam Wysocki wrote:
> Russell King - ARM Linux <linux at armlinux.org.uk> wrote:
>
> > Make sure you have "console=ttySA0,38400n8" or similar to get serial
> > console output - it needs to be a "ttySA" port, not "ttyS".
>
> Hmm... I changed to:
>
> root=0x302 mem=32m console=ttySA0,115200n8
>
> and success - it helped! The screen is still blank, but I least I have
> some messages on the serial port, finished with kernel panic because of
> failing to mount root. It looks like I didn't enable some drivers for
> the CF controller, but I look and it seems everything that should be
> enabled is enabled... maybe this kernel doesn't support CF on Jornada
> without a patch?
>
> http://pastebin.com/J2ATKxQM
>
> And I'm just wondering why the screen is blank while I definitely enabled
> the SA-1100 framebuffer support and console on framebuffer... I'm not sure
> if it should be blank when I specified console=ttySA0, but I don't think
> it should be blank without any console= setting...
Looking at the board file, the jornada720 doesn't use sa11x0-fb at all.
It uses an Epson s1d13xxx device. The defconfig for jornada720 has:
CONFIG_FB_S1D13XXX=y
so if your configuration is derived from that, you should have the
driver already enabled.
> > Same probably goes for "earlyprintk=serial,ttyS0,115200", although I've
> > no experience of earlyprintk myself.
>
> It seems that earlyprintk is ignored anyway, maybe there's no support for
> it on this platform?
No idea, sorry. I use my printascii() hack in printk() when I need early
or lowlevel debugging rather than early printk.
> > However, if you're not even getting the "Uncompressing Linux... done,
> > booting the kernel." line, that suggests the decompressor is not running,
> > or is trying to access the wrong serial port. The decompressor tries to
> > find the first serial port out of serial 3, 1 and 2 which has been left
> > enabled.
>
> In this order? Maybe it tries to send its messages to the built-in modem
> or IrDA port...
Yes, that order.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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