[Buildroot] Olimex A20 Micro - freezing during boot up

[Arnout Vandecappelle <arnout@mind.be>]

On 16-09-15 16:45, Kevin Golding wrote:
> Hello,
> 
> I've created a system based on the olimex_a20_olinuxino_micro_defconfig 

 When you say "based on", do you mean "equal to"? If not, go back to the
defconfig and check if that works. Don't hold your breath, though - see below.


> and I'm
> seeing it freeze at around 1.2 seconds during the boot up.
> 
> I'm a little worried about some of the errors during the boot such as "Failed to
> set core voltage! Can't set CPU frequency"

 This is potentially harmful.

> "*** Warning - bad CRC, using default environment" 

 This is quite harmless: U-Boot tries to read the environment from flash, but
it's not there (yet) because you never saved it.

> but as a complete newbie I'm not sure how important they are!
> 
> I've copied the serial capture below, and I would love to get my hands of
> someone's working equivalent to compare against, or any suggestions/advice?
> 
> Thanks,
> 
> Kevin
> 
> --------------------------- Serial capture below -------------------------------
> 
> U-Boot SPL 2015.04 (Sep 16 2015 - 09:57:21)
> DRAM: 1024 MiB
> Failed to set core voltage! Can't set CPU frequency
> 
> 
[snip]
> [    1.073035] axp20x 0-0034: AXP20x variant AXP209 found
> [    1.078689] axp20x 0-0034: Failed to set masks in 0x40: -6
> [    1.084264] axp20x 0-0034: failed to add irq chip: -6

 This looks potentially problematic. The AXP is the PMIC, i.e. the thing that
regulates the voltages to your CPU. If that thing is not working correctly,
things go very bad.

> [    1.092777] sunxi-wdt 1c20c90.watchdog: Watchdog enabled (timeout=16 sec,
> nowayout=0)
> [    1.101056] Driver 'mmcblk' needs updating - please use bus_type methods
> [    1.108745] sunxi-mmc 1c0f000.mmc: No vqmmc regulator found
> [    1.114990] sunxi-mmc 1c0f000.mmc: Got CD GPIO
> [    1.150750] sunxi-mmc 1c0f000.mmc: base:0xf00b8000 irq:27
> [    1.157146] sunxi-mmc 1c12000.mmc: No vqmmc regulator found
> [    1.163483] sunxi-mmc 1c12000.mmc: Got CD GPIO
> [    1.200758] sunxi-mmc 1c12000.mmc: base:0xf00bc000 irq:28
> [    1.208924] usbcore: registered new interface driver usbhid
> [    1.214589] usbhid: USB HID core driver
> [    1.220243] TCP: cubic registered
> [    1.223677] NET: Registered protocol family 17
> [    1.228168] mmc0: host does not support reading read-only switch, assuming
> write-e

 It's even stopping in the middle of a printk...

 Smells to me like a hardware issue: insufficient current or possibly even
overheating. Do you have another board to test?

 Regards,
 Arnout


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
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