early stage debugging on a real product

[Ovidiu Panait]

Hi Andy,

On 25.11.2020 17:36, Andy Shevchenko wrote:
> [Please note this e-mail is from an EXTERNAL e-mail address]
>
> On Wed, Nov 25, 2020 at 5:23 PM Simon Glass <sjg at chromium.org> wrote:
>> On Wed, 25 Nov 2020 at 08:07, Andy Shevchenko <andy.shevchenko at gmail.com> wrote:
>>> On Wed, Nov 25, 2020 at 4:50 PM Simon Glass <sjg at chromium.org> wrote:
>>>> On Wed, 25 Nov 2020 at 06:26, Andy Shevchenko <andy.shevchenko at gmail.com> wrote:
> ...
>
>>>> I think you should be more worried about the UART!
>>> How? There is no UART (there are ports, but all of them are occupied
>>> by real devices wired up). The only connector is microB and getting
>>> USB to work in a gadget mode seems to me a harder task to achieve.
>> The board designers should be severely punished. Do you have post codes?
>>
>> Some boards have an FTDI chip to do the USB/serial conversion but I
>> guess your one does not.
> It's not a board. As I stated in the subject line it's a real product
> (tablet / phone).
>
> ...
>
>>>> Note that graphics uses lazy init, like everything else in U-Boot, so
>>>> unless you have 'vidconsole' in your stdout it won't actually init it.
>>> I have no environment for now (ENV_IS_NO_WHERE) and I have provided
>>>
>>> #define CONFIG_STD_DEVICES_SETTINGS     "stdin=serial\0" \
>>>                                         "stdout=vidconsole\0" \
>>>                                         "stderr=vidconsole\0"
>>>
>>> in the configuration header. Not sure if it's correct and/or enough.
>> Should be fine.
> Thanks. But the question is still open why DM PCI et al. is not
> getting initialized.
>
> ...
>
Could you try to enable CONFIG_PCI_INIT_R=y ? This should call 
pci_init() during boot, after relocation.


Ovidiu

>>>> You can use something like this to force probing video:
>>>>
>>>> struct udevice *dev;
>>>> int ret = uclass_first_device_err(UCLASS_VIDEO, &dev);
>>> I will try this, thanks!
>> But you'll need to select the driver, or write one that finds the
>> frame buffer. Is video already set up by the earlier loader?
> Yes, there is an initialized framebuffer by bootloader (droidboot). I
> need a glue driver that will find FB parameters and set up a graphical
> console on it.
> So far I have a custom code.
>
> --
> With Best Regards,
> Andy Shevchenko