On Wed, Apr 09, 2025 at 02:33:08PM +0200, Michael Walle wrote: > Hi, > > > >> The formatting with %pa / %pap behaves like %x, which results in an > > >> incorrect value being output. To improve this, a new fine-tuning > > >> Kconfig XPL_USE_TINY_PRINTF_POINTER_SUPPORT for pointer formatting > > >> has been added. If it is enabled, the output of %pa / %pap should > > >> be correct, and if it is disabled, the pointer formatting is > > >> completely unsupported. In addition to indicate unsupported formatting, > > >> '?' will be output. This allows enabling pointer formatting only > > >> when needed. For SPL_NET and NET_LWIP it is selected by default. > > >> Then it also supports the formatting with %pm, %pM and %pI4. > > >> > > >> Signed-off-by: Christoph Niedermaier <[email protected]> > > >> --- > > >> Cc: Tom Rini <[email protected]> > > >> Cc: Simon Glass <[email protected]> > > >> Cc: Michael Walle <[email protected]> > > >> Cc: Quentin Schulz <[email protected]> > > >> Cc: Marek Vasut <[email protected]> > > >> Cc: Benedikt Spranger <[email protected]> > > >> Cc: Jerome Forissier <[email protected]> > > >> Cc: John Ogness <[email protected]> > > >> Cc: Ilias Apalodimas <[email protected]> > > >> --- > > >> Kconfig | 1 + > > >> common/spl/Kconfig | 1 + > > >> lib/Kconfig | 8 ++++++++ > > >> lib/tiny-printf.c | 45 +++++++++++++++++++-------------------------- > > >> 4 files changed, 29 insertions(+), 26 deletions(-) > > >> > > >> diff --git a/Kconfig b/Kconfig > > >> index 6379a454166..4d13717294c 100644 > > >> --- a/Kconfig > > >> +++ b/Kconfig > > >> @@ -757,6 +757,7 @@ config NET > > >> > > >> config NET_LWIP > > >> bool "Use lwIP for networking stack" > > >> + select XPL_USE_TINY_PRINTF_POINTER_SUPPORT if > > >> SPL_USE_TINY_PRINTF || TPL_USE_TINY_PRINTF || VPL_USE_TINY_PRINTF > > >> imply NETDEVICES > > >> help > > >> Include networking support based on the lwIP (lightweight IP) > > >> diff --git a/common/spl/Kconfig b/common/spl/Kconfig > > >> index 94e118f8465..72736dbecf5 100644 > > >> --- a/common/spl/Kconfig > > >> +++ b/common/spl/Kconfig > > >> @@ -1096,6 +1096,7 @@ config SPL_DM_SPI_FLASH > > >> config SPL_NET > > >> bool "Support networking" > > >> depends on !NET_LWIP > > >> + select XPL_USE_TINY_PRINTF_POINTER_SUPPORT if > > >> SPL_USE_TINY_PRINTF || TPL_USE_TINY_PRINTF || VPL_USE_TINY_PRINTF > > >> help > > >> Enable support for network devices (such as Ethernet) in SPL. > > >> This permits SPL to load U-Boot over a network link rather > > >> than > > >> diff --git a/lib/Kconfig b/lib/Kconfig > > >> index 1a683dea670..62e28d4a1f3 100644 > > >> --- a/lib/Kconfig > > >> +++ b/lib/Kconfig > > >> @@ -253,6 +253,14 @@ config VPL_USE_TINY_PRINTF > > >> > > >> The supported format specifiers are %c, %s, %u/%d and %x. > > >> > > >> +config XPL_USE_TINY_PRINTF_POINTER_SUPPORT > > >> + bool "Extend tiny printf with the pointer formatting %p" > > >> + depends on SPL_USE_TINY_PRINTF || TPL_USE_TINY_PRINTF || > > >> VPL_USE_TINY_PRINTF > > >> + help > > >> + This option enables the formatting of pointers %p. It supports > > >> + %p and %pa / %pap. If this option is selected by SPL_NET or > > >> NET_LWIP > > >> + it also supports the formatting with %pm, %pM and %pI4. > > > > > > This isn't quite what I'd like to see. I don't want to start using the > > > literal XPL namespace as that will lead to confusion down the line. > > > > OK, in V2 I will only support SPL. > > > > > Since we only have SPL_NET, I think we should name this symbol > > > SPL_USE_TINY_PRINTF_POINTER_SUPPORT, not ask about it (so bool without > > > "prompt text" following), and select from SPL_NET if > > > SPL_USE_TINY_PRINTF. > > IIRC, the old one also enabled the pointer support if DEBUG is > enabled. I don't think this will work with Kconfig.
I was looking around for, but didn't quite see, a good existing option to "if .." around the prompt text for. > > Now you will get the output '?' when using formatting with %p or %pa. > > If someone wants to use the pointer support e.g. %pa in pinctrl-single.c > > and is restricted to use tiny printf, then it would be good to have > > the option to enable it manually and not be forced to enable SPL_NET or > > NET_LWIP to have the pointer support enabled. In this case, it makes > > sense to allow switching it on in menuconfig. > > FWIW, I'm also fine with enabling full printf support as long as the > tiny one doesn't print misleading values. I'm not sure if the one non-debug %pa print in pinctrl-single.c is really triggered within SPL, and I do hope that the way this patch is otherwise done will make it easier if someone needs %pa to work when debugging a problem in SPL, and can't enable full printf due to space. -- Tom
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