[U-Boot] Uart boot broken on AM335x-evm

[Andrew F. Davis]

On 02/16/2017 08:18 AM, Tom Rini wrote:
> On Thu, Feb 16, 2017 at 07:43:31PM +0530, Lokesh Vutla wrote:
>> Hi All,
>> 	I am facing an issue with UART boot on AM335x-evm using latest U-Boot.
>> SPL is not able to download u-boot.img completely. After a bit of debug
>> with the help of Andrew, it is watchdog causing the timeout. If
>> HW_WATCHDOG is disabled, SPL is able to download the image completely
>> and u-boot successfully boots up. After this I could not progress anything.
>>
>> Wondering if anyone else is facing the same issue and any pointers to
>> debug further will be very helpful.
>>
> 
> I suspect that somewhere in the Y-MODEM code we need to be calling
> WATCHDOG_RESET()
> 

Agree, 2c77c0d6524e seems to be the culprit, the watchdog used to be
kicked in udelay(), the commit message seems it suggest it is now up to
getc(), but I can't find it getting kicked in the getc() path, I think
we need to just manually add a kick in the CYGACC_COMM_IF_GETC_TIMEOUT()
loop.

Andrew