mx53 loco boot procedure

[Sascha Hauer]

On Tue, Feb 21, 2012 at 08:38:24PM +0200, George Stefan wrote:
> Hello guys,
> After  dd if=barebox.bin of=/dev/sdb bs=512 and dd if=arch/arm/boot/uImage
> of=/dev/sdb bs=512 seek=768 i am getting
> 
> Board: Freescale i.MX53 LOCO registered netconsole as cs1 eth at eth0: got MAC
> address from EEPROM: 00:04:9F:01:B4:5B mci at mci0: No partition table found
> Cannot reset the SD/MMC interface Malloc space: 0x7df00000 -> 0x7fefffff
> (size 32 MB) Stack space : 0x7def8000 -> 0x7df00000 (size 32 kB) envfs:
> wrong magic on /dev/env0 no valid environment found on /dev/env0. Using
> default environment running /env/bin/init... Hit any key to stop autoboot:
> 1 phy0: Link is up - 100/Full T DHCP client bound to address
> 128.224.168.167 TFTP from server 128.224.168.11 ('zImage-loco' -> '/image')
> 
> Wasn't the board suppose to boot from sd card by default?
> 
> Also, i have another question. I want to replace
> 
> /* call start_barebox with its absolute address */
>         r = (unsigned int)&start_barebox;
>         __asm__ __volatile__("mov pc, %0" : : "r"(r));
> 
> &start_barebox with the actual address of the uImage practically to skip
> all the barebox part and
> boot only with the minimal CPU and memory setup. What do you think?

You can't jump directly into uImages. It would work with a zImage, but
how do you get your zImage from the sd card without the help of the
bootloader? Well, you could link barebox and a zImage together, but then
you'll realize that the internal ROM code is quite slow when reading
data from SD cards (unless there are ways to tweak this, I don't know)

What are your goals trying this?

Sascha

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