[PATCH next v3] Kconfig: select SPL_USE_TINY_PRINTF_POINTER_SUPPORT for K3

[Anshul Dalal]

On Tue Dec 16, 2025 at 7:31 PM IST, Tom Rini wrote:
> On Tue, Dec 16, 2025 at 01:52:37PM +0530, Anshul Dalal wrote:
>> Hi all,
>> 
>> Any updates on this patch? If possible could we pull this fix into
>> master as well for the 2026.01 release?
>
> I thought the feedback was that this was a generic problem and so the
> Kconfig logic should be universal, or there was an incorrectly /
> sub-optimally handled case in the tiny printf code, that needs fixing.

We have a few ways to go about fixing this:

1. Fix the commit 1e24e84db41a ("tiny-printf: Handle formatting of %p
   with an extra Kconfig"):

   Pointer formatting used to fall back to %x handling before the
   commit. Though going by the commit description, it looks like the
   change was intended. So, I'm unsure if we should re-introduce the
   confusing handling back where %p is handled but not %pa or %pap.

2. Add SPL_USE_TINY_PRINTF_POINTER_SUPPORT per defconfig:

   This was what v2 of the series were attempting to do but as Andrew
   pointed out, there might be other platforms with similar issues and
   it would be better to fix it for K3 overall.

3. Change usage of %p in k3_sysfw_dfu_download to %x:

   This is a suitable fix imo but we might still have to fix similar
   usages of %p in other places. We'd also have to be more careful when
   bringing proper U-Boot code to SPL since %p would not work the same
   way.

4. Unconditionally select SPL_USE_TINY_PRINTF_POINTER_SUPPORT for K3:

   This allows us to remedy the problems with above 3 solutions with
   very little overhead to the SPL size (<100 bytes).

If this problem is faced by non K3 platforms as well, perhaps it might
be better to take the hit and make SPL_USE_TINY_PRINTF_POINTER_SUPPORT
default y.

Regards,
Anshul