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authorMike Frysinger <michael.frysinger@analog.com>2007-05-21 18:09:27 +0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-21 09:50:22 -0700
commit5079df993c3ab45af10dc9a45b3b9e712fd56f23 (patch)
tree9c978e20be84f4cc058d6a56cda5cdf497bc2be7 /arch/blackfin/mach-bf561
parentBlackfin arch: issue reset via SWRST so we dont clobber the watchdog state (diff)
downloadlinux-dev-5079df993c3ab45af10dc9a45b3b9e712fd56f23.tar.xz
linux-dev-5079df993c3ab45af10dc9a45b3b9e712fd56f23.zip
Blackfin arch: document why we have to touch the UART peripheral in our boot up code
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/blackfin/mach-bf561')
-rw-r--r--arch/blackfin/mach-bf561/head.S3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/blackfin/mach-bf561/head.S b/arch/blackfin/mach-bf561/head.S
index 04f3ac33ab0e..9c8e6885f4e7 100644
--- a/arch/blackfin/mach-bf561/head.S
+++ b/arch/blackfin/mach-bf561/head.S
@@ -127,7 +127,8 @@ ENTRY(__stext)
STI R2;
#endif
- /* Initialise UART*/
+ /* Initialise UART - when booting from u-boot, the UART is not disabled
+ * so if we dont initalize here, our serial console gets hosed */
p0.h = hi(UART_LCR);
p0.l = lo(UART_LCR);
r0 = 0x0(Z);