Re: [PATCH 0/6] auxdisplay: Add support for the Titanmec TM1628 7 segment display controller

[Andreas Färber <afaerber@xxxxxxx>]

On 22.02.22 15:48, Neil Armstrong wrote:
> On 22/02/2022 13:12, Andreas Färber wrote:
>> On 19.02.22 18:16, Heiner Kallweit wrote:
>>> On 19.02.2022 17:07, Andreas Färber wrote:
>>>> [...] (And most Realtek platforms got
>>>> broken by removing the adjustable text base defines.)
>>>>
>>> I'm not aware of the Realtek platform issue, do you have a link to a
>>> related discussion?
>>
>> Realtek has a boot ROM at the beginning of memory space, which has been
>> a problem from the first RFC and for most bootloaders required to tweak
>> the kernel's text offset for successful boot. (Some not Open Source (LK)
>> and/or not openly flashable.)
>>
>> http://lists.infradead.org/pipermail/linux-arm-kernel/2017-February/487718.html
>>
>>
>> In 2020 that arm64 feature got removed without any further discussion:
>>
>> https://lore.kernel.org/all/20200825135440.11288-1-ardb@xxxxxxxxxx/
> 
> Note the TEXT_OFFSET is only an issue with Amlogic vendor bootloader,
> it has never been an issue with mainline U-Boot.

There is no mainline U-Boot for Realtek DHC (!= Amlogic Meson) though!

More important drivers than LED got blocked here, too, like MMC and USB
and pinctrl and clk.

And as hinted above, some Realtek boards come with a vendor LK that I
can't even patch a downstream version of.

Regards,
Andreas

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