Booting linux on a custom iMX27 board

Booting linux on a custom iMX27 board

[Igor]

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Hi,

I 'm trying to port Barebox (2012.01.0) and make it successfully booting
Linux
on a custom board based on iMX27.
I could successfully configure, compile and use Barebox on my MX27ADS board,
making it work both as a second stage bootloader (after Redboot)
and as the first stage bootloader (booting the system from flash).

I modified the sources to adapt the low level init functions to my HW
that has half the ram of the ev.board and a different flash
(a Spansion S29GLxxx, same size of the one in the eva board).
With my customized version of Barebox I can:
- boot Linux (zImage, 2.6.32.3) using Barebox as a second stage bootloader
(after Redboot)
- start from Flash as a first stage bootloader, correctly initializing the
system.

In the second case, indeed, the system seems to be fully working:
I can read and write the flash partitions, I can complete successfully
the ram test with "mtest", but... I cannot boot Linux!

I just get:
"uncompressing linux... done booting the kernel"
and then it's silence...

architecture_type is 846 (it's the one of the mx27ads).
It should be right  considering that I used both for the kernel and for the
bootloader
the configuration for imx27ads.

I also tryed to make it boot a more recent kernel version;
I compiled a 3.0.8 with early_printk anabled to get more info about
the initial crash/problem  but... Nothing!
I didn't get nothing after "... done booting the kernel" also with the 3.0.8
with low level debug and early_printk enabled.

What's the reason for the boot failure?
I'm desperately looking for new ideas and suggestions!

Thanks in advance for every possible hint,
Igor.


-- 
"Don't find fault, find a remedy."
(Henry Ford)

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Re: Booting linux on a custom iMX27 board

[Uwe Kleine-König]

Hello,

On Thu, Jan 26, 2012 at 09:23:32PM +0100, Igor wrote:
> Hi,
> 
> I 'm trying to port Barebox (2012.01.0) and make it successfully booting
> Linux
> on a custom board based on iMX27.
> I could successfully configure, compile and use Barebox on my MX27ADS board,
> making it work both as a second stage bootloader (after Redboot)
> and as the first stage bootloader (booting the system from flash).
> 
> I modified the sources to adapt the low level init functions to my HW
> that has half the ram of the ev.board and a different flash
> (a Spansion S29GLxxx, same size of the one in the eva board).
> With my customized version of Barebox I can:
> - boot Linux (zImage, 2.6.32.3) using Barebox as a second stage bootloader
> (after Redboot)
> - start from Flash as a first stage bootloader, correctly initializing the
> system.
> 
> In the second case, indeed, the system seems to be fully working:
> I can read and write the flash partitions, I can complete successfully
> the ram test with "mtest", but... I cannot boot Linux!
> 
> I just get:
> "uncompressing linux... done booting the kernel"
> and then it's silence...
> 
> architecture_type is 846 (it's the one of the mx27ads).
> It should be right  considering that I used both for the kernel and for the
> bootloader
> the configuration for imx27ads.
> 
> I also tryed to make it boot a more recent kernel version;
> I compiled a 3.0.8 with early_printk anabled to get more info about
> the initial crash/problem  but... Nothing!
> I didn't get nothing after "... done booting the kernel" also with the 3.0.8
> with low level debug and early_printk enabled.
Do you have configured the right output port for low level debug? Did
you pass the earlyprintk kernel parameter?

Do you have a jtag debugger?
 
> What's the reason for the boot failure?
Probably not a bootloader problem.

Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: Booting linux on a custom iMX27 board

[Igor]

Hi Uwe,

first of all thanks for the answer.
A few minutes ago I could see the answer that Sasha Hauer sent to Marek Belisko
(that was having a problem similar to mine) and it was "illuminating"!

> Do you have configured the right output port for low level debug? Did
> you pass the earlyprintk kernel parameter?

I didn't know that early printk has to be enabled with a cmd line option!
Sorry...
So I changed Barebox bootargs and I could see my 3.0.8 kernel talking to me!
And this helped the following debug...

>
>> What's the reason for the boot failure?
> Probably not a bootloader problem.
>

You were "probably" right... ;-)

Thanks,
I.

-- 
"Don't find fault, find a remedy."
(Henry Ford)

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