On 07/25/2014 10:33 PM, Grant Likely wrote:
On Fri, 25 Jul 2014 09:15:22 -0500, Rob Herring <robherring2@xxxxxxxxx> wrote:
On Fri, Jul 25, 2014 at 6:02 AM, Vineet Gupta
<Vineet.Gupta1@xxxxxxxxxxxx> wrote:
Hi Grant,
linux-next has a series for arc_uart (via tty tree) which converts it to generic
earlycon and specifies console via /chosen/stdout-path vs. an explicit param in
/chose/bootargs
2014-06-24 9da433c0a0b5 ARC: [arcfpga] stdout-path now suffices for earlycon/console
This relied on prev commit of yours (from linux next of 20140711), which seem to
have disappeared now.
2014-03-27 a9296cf2d0b6 of: Create of_console_check() for selecting a console
specified in /chosen
2014-03-27 cfa9cacc5dd3 of: Enable console on serial ports specified by
/chosen/stdout-path
Is there a specific reason for dropping these patches (or perhaps a merge to be
merged). I cherry-picked both but still doesn't work.
Can you please advise next step forward, before I go off debugging with those
patches in.
There's an issue that if you have stdout-path and "earlycon" on the
command line, the kernel will switch to tty0 and disable the earlycon.
This is the "fix", but I don't like adding the DT dependency into generic code:
Yes, I'm not fond of it either. I've not been able to test it though and
work out a proper bug fix. As far as I can understand, the earlycon code
only works on aarch64, correct? I haven't been able to get an aarch64
boot working in QEMU yet.
Have a look at [1]. This worked for me with the latest qemu and the latest
pre-built root file system from [2].
Guenter
---
[1] http://www.bennee.com/~alex/blog/2014/05/09/running-linux-in-qemus-aarch64-system-emulation-mode/
[2] http://people.linaro.org/~alex.bennee/images/aarch64-linux-3.16rc3-buildroot.img
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