[U-Boot] Data abort in omap_gpio

Andreas Bießmann
2014-04-10T07:22:53Z

Dear Tom Rini,

On 04/09/2014 05:37 PM, Tom Rini wrote:
> On Wed, Apr 09, 2014 at 05:22:57PM +0200, Andreas Bie?mann wrote:

>> (gdb) s
>> 118 __raw_writel(l, reg);
>> (gdb) print/s l
>> $17 = 2048
>> (gdb) print/x l
>> $18 = 0x800
>> (gdb) print/x reg
>> $19 = 0x49050090
>> (gdb) s
>> ^C
>> Program received signal SIGSTOP, Stopped (signal).
>> _start () at /home/abiessmann/src/u-boot/arch/arm/cpu/armv7/start.S:27
>> 27 ldr pc, _data_abort
>> (gdb)
>> --->8---
>>
>> (Encounterd with tricorder board current ToT)
>>
>> I'll dive into that tomorrow. If anyone has some pointeres, please speak
>> out loud ;)
>
> You need to add the relevant CONFIG_OMAP3_GPIO_n define to enable
> clocks/etc for the gpios being used.
>

Well, it is GPIO 42/43 which is located in bank 1. These clocks are not
enabled explicitly in 708cfb74b7c6df9c37d3c48988a154be79daefeb. I
haven't followed the dsicussen but wonder why we do not switch the
clocks on gpio_request().

So is it seems that 708cfb74b7c6df9c37d3c48988a154be79daefeb missed to
enable clocks for bank 1. I'll try that.