[U-Boot] Das U-Boot 'bootaux' command breaks USB communication from and to main CPU

[Lukasz Majewski]

Hi Lucan,

> Dear sir, madam,
> 
> 
> Our product uses the i.MX 6SoloX SOC with a Cortex A9 and M4, U-Boot
> runs on the A9 and boots Linux. But before booting Linux it executes
> the 'bootaux 0x7F800' command to boot the M4. However, Linux is
> unable to initialize the USB when this command is executed.
> 
> 
> This problem persist when:
> 
> - there is no binary loaded on the M4 (and thus it is not code on the
> M4 that's breaking the USB);
> 
> - the bootaux command is called with a different address (and thus
> not it is not booting the M4 that's breaking the USB).
> 
> 
> The problem is solved when the bootaux command is removed from the
> boot sequence.

This is very strange. I thought that bootaux loads the binary to memory
and points Cortex-M's PC to it.

> However, this way only the A9 boots and we would like
> to boot the M4 as well.
> 
> 
> Our U-Boot version is: 2015.04-master+gc75e0f3
> 

Would there be any chance to check newest master ?

> 
> We are currently looking into different ways to boot the M4 from
> Linux instead of U-Boot, however we were hoping you could help us too.
> 

I do have a HW with NXP's Vybrid SoC (Cortex-A5 and M3). However, my
used case doesn't require loading M3 firmware.

> 
> Hope te hear from you soon,
> 
> 
> Lucan de Groot
> Embedded Software Engineer
> + 31 (0)6 409 170 21
> lucan.degroot at quby.com  | www.quby.com<http://www.quby.com/> |
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> 
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Best regards,

Lukasz Majewski

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