Subject: n900: kernel cmdline from bootloader in DT mode

From: [email-masked] (Pali Rohár)
Date: Wed, 26 Nov 2014 16:27:57 +0100

On Wednesday 26 November 2014 16:22:00 Pavel Machek wrote:
> On Wed 2014-11-26 14:36:42, Pali Roh?r wrote:
> > On Wednesday 26 November 2014 14:28:01 Pavel Machek wrote:
> > > Hi!
> > > 
> > > > for some unknown reasons when I compile kernel for n900
> > > > in DT mode it ignore cmdline passed by bootloader. When
> > > > I comment
> > > > 
> > > > CONFIG_ARM_APPENDED_DTB=y
> > > > 
> > > > then it boots into legacy board mode and cmdline is used
> > > > from bootloader.
> > > > 
> > > > When is problem?
> > > 
> > > It seems to work for me, I'm booting using 0xffff, with
> > > attached config.
> > > 
> > > 									Pavel
> > 
> > Can you try to set some "root=something" into CONFIG_CMDLINE
> > and then add real "root=" param via 0xffff?
> > 
> > My problem is that I have specified ubifs mtd root in
> > CONFIG_CMDLINE and when I set correct root via bootloader
> > (from 0xffff or flasher-3.5) it is ignored and used only
> > what is specified in CONFIG_CMDLINE.
> 
> CONFIG_ARM_ATAG_DTB_COMPAT=y
> CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER=y
> # CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND is not set
> CONFIG_CMDLINE="console=ttyO2,115200 console=tty"
> 
> Um.. Internal commandline should be completely ignored for me.
> 
> Do you have
> CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER?
> 
> 									Pavel

Yes, I have:

CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER=y
CONFIG_CMDLINE="...."
CONFIG_CMDLINE_FROM_BOOTLOADER=y

-- 
Pali Roh?r
pali.rohar at gmail.com
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