Re: u-boot debug, was: Re: U-boot on RPI3, sees disk but won't boot it

> Am 27.09.2022 um 21:20 schrieb Mark Millard <marklmi@yahoo.com>:
> 
> On 2022-Sep-27, at 11:33, Klaus Küchemann <maciphone2@googlemail.com> wrote:
> 
> 
>>> Am 27.09.2022 um 19:58 schrieb Klaus Küchemann <maciphone2@googlemail.com>:
>>> 
>>> 
>>>> Am 27.09.2022 um 18:03 schrieb bob prohaska <fbsd@www.zefox.net>:
>>>> 
>>>> I did look at common/usb.c but it's far from obvious how one
>>>> can turn on the logging feature so as to report more errors
>>>> to the console.
>>> 
>>> you can add the following to common/usb.c (e.g. insert in line 44):
>>> 
>>> #define DEBUG
>>> 
>>> --
>>> 
>>> that should then print out all debug functions inside the usb.c file to the console 
>>> after recompilation of u-boot.
>>> 
>>> Regards
>>> 
>>> Klaus
>> 
>> I saw there is  /*#include <log.h>*/ available in usb.c 
>> so you could also try to add :
>> 
>> #define LOG_DEBUG
>> 
>> to the common/usb.c file which should also then enable the debug functions
>> which then would be output in logging style.
>> 
>> You will need the debug output to to narrow down the issue.
>> 
>> just a guess : 
>> electrical problem(of the Pi itself)  which could perhaps be fixed by  manipulating the scan delay time .
> 
> Looks to me like:
> 
> https://github.com/u-boot/u-boot/blob/master/common/usb_hub.c
> 
> might be relevant, not just:
> 
> https://github.com/u-boot/u-boot/blob/master/common/usb.c
> 
> 
> For example, usb_hub.c is where usb_pgood_delay is involved.
> (My patch to enable my boot media assigns that, not that
> such helped Bob.)
> 
> But I've not been able to uniquely identify all the specific
> identifiers for all the (relevant) "usb boot scan delays",
> although I'd expect that pgood_delay (and its usb_pgood_delay)
> would be considered an example.
> 
> ===
> Mark Millard
> marklmi at yahoo.com

good idea,
I would then suggest to enable debug also in common/usb_hub.c
by adding #define DEBUG or #define LOG_DEBUG ..

for the usb.c I’d expect something from the mdelay function as an usb scan timer..
so let’s see what debug logs  usb.c & usb_hub.c  will spit out ..

Regards 

Klaus