tiny-printf: Handle formatting of %p with an extra Kconfig
The formatting with %pa / %pap behaves like %x, which results in an
incorrect value being output. To improve this, a new fine-tuning
Kconfig SPL_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 it is selected by default. Then it also
supports the formatting with %pm, %pM and %pI4.
In summery this level of %p support for tiny printf is possible now:
1) The standard tiny printf won't have support for pointer formatting.
So it doesn't print misleading values for %pa, instead '?' will be
output:
%p => ?
%pa => ?a
%pap => ?ap
2) If SPL_USE_TINY_PRINTF_POINTER_SUPPORT is enabled or DEBUG is defined
tiny printf supports formatting %p and %pa / %pap.
3) If SPL_NET is enabled the support of pointers is extended
for %pm, %pM and %pI4.
Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index b2aecd8..cdf8f7e 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -253,6 +253,14 @@
The supported format specifiers are %c, %s, %u/%d and %x.
+config SPL_USE_TINY_PRINTF_POINTER_SUPPORT
+ bool "Extend tiny printf with the pointer formatting %p"
+ depends on SPL_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
+ it also supports the formatting with %pm, %pM and %pI4.
+
config PANIC_HANG
bool "Do not reset the system on fatal error"
help