Re: [PATCH 0/9] arm64: introduce Black Sesame Technologies C1200 SoC and CDCU1.0 board

On Thu, Sep 25, 2025 at 03:38:44PM +0200, Arnd Bergmann wrote:

On Thu, Sep 25, 2025, at 15:34, Ulf Hansson wrote:

quoted

On Thu, 25 Sept 2025 at 14:12, Albert Yang [off-list ref] wrote:

quoted

On Thu, Sep 25, 2025 at 05:03:57PM +0800, Albert Yang wrote:

Hi Arnd,

I may have missed an important detail in my previous note. If I split
out the MMC-related patches and submit only the SoC parts first, I
cannot validate the SoC on real hardware: both the kernel and the root
filesystem live on the MMC device. Without the MMC stack (DT bindings
and the controller driver), the board does not boot to userspace, so I
cannot properly verify the SoC/DT changes in isolation.

At least to me, I would not consider that a problem. As long as you
can test the pieces together "manually" that's fine, I think.

I mean, the platform was not supported in the first place, so it's not
like we would be introducing a regression - or break something, right?

Agreed, it's rare for newly added platforms to immediately have
everything working, and we can still fix things if they don't.

It's also possible to test userspace by using a standalone
initramfs with a login shell or an automated test suite, but
I don't require that.

Hi Arnd, Ulf,

Thank you both for the clarifications.

Understood regarding validation expectations. I'll proceed with the split:
  * v5 SoC series (no MMC binding/driver, no mmc nodes in dtsi)
  * Separate MMC series (binding + driver) to linux-mmc
  * Follow-up enable patch once the driver lands


If any critical fix is found while iterating on the MMC series, I'll send
a follow-up patch depending on timing.

I'll move ahead with preparing v5 accordingly.

Thanks again for the guidance.

Best regards,
Albert Yang