imx53qsb boot up problems

[GiulioBenetti]

Hi all,

i've tried with different imx53-QSB (4 in total, all equal) to power on and off very fast.

After 2-3 times imx53 enters Serial Download Mode.

It seems it doesn't recognize right the first 2K on Sd card.

To exit this status there are 2 ways, assert reset or shutdown, also waiting for power supply to die.

I use a hw patch posted here time ago to automatically power up da9053,

anyway even if you use power up button the result is the same.

On errata the only thing I've found was to set bootstrap pins to avoid fast boot and fast sdhc.

This was because of propagation delay on data lines of sd.

To reproduce the problem try to power it up very fast for at least 10 times.

da9053 works fine.

Maybe voltages timing are the problem.

Hope someone can help me.

[roybunce]

Thanks Jerry, this solved a problem I posted yesterday - http://imxcommunity.org/group/imx53hardwaredesign/forum/topics/star...

[JerryFan]

Hi,

Please make sure the command "REG_LD_AND_STR_OP(29, 0x0f8, 0x00000800)" included in the flash_header.S

[GiulioBenetti]

It's flash_header.S shipped with 11.09.

I'm sure it causes the problem.

My board starts up 1 time yes 1 time no.

[JerryFan]

Could you post the flash_header.S file, so we can tell this file caused this issue or not?

I think plug-in should be ok. 

[GiulioBenetti]

On 11.09 u-boot there is problem on plug-in for booting.

That makes unstable boot process.

I recommend to use old flash_header.S where app pointer is _start:

app_code_jump_v:  .word _start

[KrishnaPavan]

Hi,

Not only that, but, LTIB uses different cross-compilation tool chains for different versions.

[GiulioBenetti]

Found.

It was u-boot too new.

With qsb you have to use u-boot from 11.01, using 11.09 makes some problem on reset.

I thought it was bootstrapping, instead it was u-boot doing something wrong, what I don't know.

[GiulioBenetti]

Do you mean on cfg pins?

I think it's set ok.

The problem is that 4 times on 5 it boot up ok.

But the last it go to serial download mode.

If you have any idea please tell me.

[KrishnaPavan]

Hi ,

When boot mode is not set properly, it goes to default mode, the serial download mode. Check that..!