Re: booting linux

[Sascha Hauer <s.hauer@pengutronix.de>]

On Wed, Mar 02, 2011 at 02:03:27PM +0100, Vanalme Filip wrote:
> > -----Original Message-----
> > From: Baruch Siach [mailto:baruch@tkos.co.il]
> > Sent: woensdag 2 maart 2011 11:46
> > To: Vanalme Filip
> > Cc: barebox@lists.infradead.org
> > Subject: Re: booting linux
> > 
> > Hi Vanalme,
> > 
> > On Wed, Mar 02, 2011 at 11:31:31AM +0100, Vanalme Filip wrote:
> > 
> > [snip]
> > 
> > > Then I do :
> > >
> > > barebox:/ bootz /dev/nand0.kernel.bb
> > > loaded zImage from /dev/nand0.kernel.bb with size 1777792
> > > commandline: console=ttymxc0,115200 ip=dhcp root=/dev/mtdblock7
> > rootfstype=jffs2
> > mtdparts=mxc_nand:256k(barebox)ro,128k(bareboxenv),5M(kernel),-(root)
> > > arch_number: 1802
> > > Uncompressing
> > Linux........................................................................................................................... done,
> > booting the kernel.
> > 
> > If your kernel is recent enough (2.6.33 or newer) try the following:
> > 
> > 1. Enable EARLY_PRINTK in your .config
> > 
> > 2. Add "earlyprintk" to your bootargs
> > 
> > 3. Boot the kernel
> > 
> > Post here what you see.
> 
> [Filip] 
> Unfortunately, the kernel I use is version 2.6.22. But, no problem, I
> got a kernel 2.6.38 version from one of my colleagues (who is porting
> the kernel to our i.MX27PDK board). With EARLY_PRINTK enabled.  First
> time I tried to start the kernel, I got a message that machine types
> of barebox and kernel did not match. In barebox, I'm using
> MACH_TYPE_IMX27, while kernel is using MACH_TYPE_IMX27_3DS
> (unfortunately, I did not capture the console output for that
> attempt...). So I changed barebox to use also MACH_TYPE_IMX27_3DS
> and............kernel boots !  It ends with a kernel panic, but it
> boots !  I don't know if the incompatible machine code could also have
> been the problem when I tried booting the 2.6.22. We will anyhow
> continue working on porting the 2.6.38 to our board, so I think it's
> no use to continue investigating the 2.6.22.

I guess the 2.6.22 kernel is a Freescale kernel. These need system_rev
to be set properly.

Sascha

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