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authorAneesh V <aneesh@ti.com>2012-03-08 07:20:19 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-05-15 08:31:26 +0200
commit5356f5451e85695cf8f9782dee54cc8dfa5445e5 (patch)
tree17ec91695ba5ed4845801b66fa5de31f46d3d868 /README
parent74236acacc27168102b2e3fbcac3a80e5ed82fe4 (diff)
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ARM: enable Thumb build
Enable Thumb build and ARM-Thumb interworking based on the new config flag CONFIG_SYS_THUMB_BUILD Signed-off-by: Aneesh V <aneesh@ti.com> Acked-by: Mike Frysinger <vapier@gentoo.org>
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+++ b/README
@@ -432,6 +432,14 @@ The following options need to be configured:
Select high exception vectors of the ARM core, e.g., do not
clear the V bit of the c1 register of CP15.
+ CONFIG_SYS_THUMB_BUILD
+
+ Use this flag to build U-Boot using the Thumb instruction
+ set for ARM architectures. Thumb instruction set provides
+ better code density. For ARM architectures that support
+ Thumb2 this flag will result in Thumb2 code generated by
+ GCC.
+
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ