[U-Boot] [PATCH 1/3] Kconfig add config ERR_PTR_OFFSET
Simon Goldschmidt
simon.k.r.goldschmidt at gmail.com
Tue Oct 22 19:29:46 UTC 2019
Some U-Boot pointers have redundant information, so we can use a scheme
where we can return either an error code or a pointer with the same
return value. The default implementation just casts the pointer to a
number, however, this may fail on platforms where the end of the address
range is used for valid pointers (e.g. 0xffffff00 is a valid heap pointer
in socfpga SPL). For such platforms, this value provides an upper range
of those error pointer values - up to 'MAX_ERRNO' bytes below this value
must be unused/invalid addresses.
Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---
Kconfig | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/Kconfig b/Kconfig
index 66b059f749..cda4f58ff7 100644
--- a/Kconfig
+++ b/Kconfig
@@ -281,6 +281,20 @@ config SYS_LDSCRIPT
Path within the source tree to the linker script to use for the
main U-Boot binary.
+config ERR_PTR_OFFSET
+ hex
+ default 0x0
+ help
+ Some U-Boot pointers have redundant information, so we can use a
+ scheme where we can return either an error code or a pointer with the
+ same return value. The default implementation just casts the pointer
+ to a number, however, this may fail on platforms where the end of the
+ address range is used for valid pointers (e.g. 0xffffff00 is a valid
+ heap pointer in socfpga SPL).
+ For such platforms, this value provides an upper range of those error
+ pointer values - up to 'MAX_ERRNO' bytes below this value must be
+ unused/invalid addresses.
+
endmenu # General setup
menu "Boot images"
--
2.20.1
More information about the U-Boot
mailing list