diff options
| author | Mike Dunn | 2013-06-21 09:12:28 -0700 |
|---|---|---|
| committer | Marek Vasut | 2013-06-22 15:25:28 +0200 |
| commit | 9dc8fef2583f23ca6a99c6f5e709a8b80018364f (patch) | |
| tree | 7bcd2987166a8f966dcfc4e4610376d7f061ea36 /arch/arm/lib | |
| parent | 84c617beb2ddcda03e36abe553432e2784ada6b7 (diff) | |
pxa: fix memory coherency problem after relocation
On the xscale, the icache must be invalidated and the write buffers drained
after writing code over the data bus, even if the caches are disabled. Tested
on the pxa270.
Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/relocate.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/lib/relocate.S b/arch/arm/lib/relocate.S index 949b9e8025b..cd2bab6cde7 100644 --- a/arch/arm/lib/relocate.S +++ b/arch/arm/lib/relocate.S @@ -70,6 +70,15 @@ fixnext: relocate_done: +#ifdef __XSCALE__ + /* + * On xscale, icache must be invalidated and write buffers drained, + * even with cache disabled - 4.2.7 of xscale core developer's manual + */ + mcr p15, 0, r0, c7, c7, 0 /* invalidate icache */ + mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */ +#endif + /* ARMv4- don't know bx lr but the assembler fails to see that */ #ifdef __ARM_ARCH_4__ |