Re: signed HDMI firmware in imx8mq image

["Yazdani, Reyhaneh" <RYazdani@data-modul.com>]

On 1/16/19 9:30 PM, Andrey Smirnov wrote:
> On Wed, Jan 16, 2019 at 1:34 AM Lucas Stach <l.stach@pengutronix.de> wrote:
>>
>> Hi Reyhaneh,
>>
>> Am Mittwoch, den 16.01.2019, 08:48 +0000 schrieb Yazdani, Reyhaneh:
>>> Every one,
>>>
>>> In order to build a Barebox image to boot imx8mq-evk with HDMI, I have tried to
>>> tell Barebox about the embedded signed HDMI firmware, which is necessary for
>>> provided kernel image by NXP.
>>>
>>> for this matter, I added the below line into the
>>> arch/arm/boards/nxp-imx8mq-evk/flash-header-imx8mq-evk.imxcfg
>>>
>>>   soc imx8mq
>>>   loadaddr 0x007E1000
>>>   dcdofs 0x400
>>> + signed_hdmi_firmware firmware/imx/signed_hdmi_imx8m.bin
>>>
>>> And placed the firmware into the build-directory/firmware/imx
>>>
>>>
>>> By checking kernel boot message, it seems the HDMI FW is running, but no access
>>> to the HDMI:
>>> [drm:hdmi_phy_init_t28hpc] *ERROR* HDMI mailbox access failed
>>>
>>> What should I do more in Barebox to make HDMI accessible by kernel?
>>
>> I don't think there is anything more needed from the Barebox side. At
>> least the same change works for me and gets me a working HDMI display
>> on the EVK board.
>>
>
> FWIW, I don't see anything missing either.
>
>> I don't use the NXP kernel through, but running a 4.20 based kernel
>> with lot of downstream bits ported. This might be a incompatibility of
>> your kernel with the imx8 ATF version shipped with Barebox.
>>
>
> I was using vendor kernel when I was working on
> implementing/validating initial support of that and it worked alright.
> However, that has been over 5 month ago, so it is entirely possible
> that newer version of various components might have become
> problematic.
>
> It is probably not a problem in your case, but do keep in mind, that
> i.MX8MQ mask ROM code uses SD2 as a "backup" boot option, so if it
> doesn't find anything bootable on the selected (via pins or fuses)
> medium it will revert to that. If that happens, HDMI firmware present
> on SD card will _not_ be loaded into HDMI IP block. I've been bitten
> by this when I was working with a board that I forgot was configured
> to boot from eMMC and was booting from SD card by coincidence.
>
> Thanks,
> Andrey Smirnov
>

Hi Andrey,

Thanks for your comment.

I am booting  from SD card. And the card with complete NXP image(uboot+kernel)
loads completely. When I replace uboot with Barebox, HDMI error happens.

The point is, before adding signed_hdmi_firmware into Barebox, I got the error
during kernel boot regarding no FW loaded.

But after that, kernel detects HDMI FW is loaded but cannot communicate with it.

Best,
Reyhaneh
--
Reyhaneh Yazdani
Data Modul AG                            TEL:    +49-89-56017-154
Embedded development                 FAX:    +49-89-56017-119
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