[SRU][F/J/L] [PATCH 0/1] enable Renesas RZ platform serial installer

[Tim Gardner]

On 8/14/23 8:23 AM, Andrea Righi wrote:
> On Mon, Aug 14, 2023 at 07:02:06AM -0600, Tim Gardner wrote:
>> On 8/14/23 1:13 AM, Andrea Righi wrote:
>>> BugLink: https://bugs.launchpad.net/bugs/2022361
>>>
>>> [Impact]
>>>
>>> The ubuntu installer does not work via serial ports for Renesas boards
>>> like RZ/G2M-HiHope
>>> (https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rz-mpus/rzg2m-hihope-rzg2m-reference-board,
>>> RZ/G2L, RZ/G2LC, RZ/G2UL SMARC Board
>>> (https://renesas.info/wiki/RZ-G/RZ-G2L_SMARC).
>>>
>>> The installation can be done using HDMI ports, but it would be nice to
>>> support installation via serial port as well.
>>>
>>> [Test case]
>>>
>>> Try to install Ubuntu on a Renesas board.
>>>
>>> [Fix]
>>>
>>> Statically build SuperH SCI(F) serial port support (with earlyconsole).
>>>
>>> [Regression potential]
>>>
>>> Statically building an additional driver in the kernel can make the
>>> kernel image bigger, potentially causing boot issues in small (arm64 /
>>> armhf) platforms.
>>>
>>>
>>
>> Why would we do this for kernels older then Lunar ? If a cloud developer is
>> not vigilant, it will also affect the size of cloud images given the new
>> annotations scheme (if the derivative includes from debian.master).
> 
> If anyone wants to install focal in those Renesas boards it requires
> this change.
> 
> But your point is really valid, this should be applied only to generic,
> now that the derivatives are all (almost) importing all the configs from
> generic, it would be up to the individual maintainers of each cloud
> kernel to turn this off in the specific cloud kernel annotations.
> 
> At the moment we don't have a way to say "do not propagate this config
> to derivative kernels", I'm wondering if something like this might be
> useful.
> 
> -Andrea

I don't have a good feel for how popular these boards are, but 
increasing the image size (though it may not be a very big size change) 
impacts stable releases. You risk pushing one of Stefan's hot buttons.

I will watch for this change in the cloud kernels assigned to me. It may 
be a moot point since the infrastructure for this feature may not even 
be enabled for arm64.

rtg
-- 
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Tim Gardner
Canonical, Inc