diff options
| author | Mike Frysinger <michael.frysinger@analog.com> | 2007-05-21 18:09:27 +0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-21 09:50:22 -0700 |
| commit | 5079df993c3ab45af10dc9a45b3b9e712fd56f23 (patch) | |
| tree | 9c978e20be84f4cc058d6a56cda5cdf497bc2be7 /arch/blackfin | |
| parent | ef9256d2831df0896566c3823cd2bdf0e55df984 (diff) | |
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')
| -rw-r--r-- | arch/blackfin/mach-bf533/head.S | 3 | ||||
| -rw-r--r-- | arch/blackfin/mach-bf537/head.S | 3 | ||||
| -rw-r--r-- | arch/blackfin/mach-bf561/head.S | 3 |
3 files changed, 6 insertions, 3 deletions
diff --git a/arch/blackfin/mach-bf533/head.S b/arch/blackfin/mach-bf533/head.S index 1a54ff5f061..4db9e624090 100644 --- a/arch/blackfin/mach-bf533/head.S +++ b/arch/blackfin/mach-bf533/head.S @@ -173,7 +173,8 @@ 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); diff --git a/arch/blackfin/mach-bf537/head.S b/arch/blackfin/mach-bf537/head.S index aafc686749e..b4377dddc12 100644 --- a/arch/blackfin/mach-bf537/head.S +++ b/arch/blackfin/mach-bf537/head.S @@ -181,7 +181,8 @@ ENTRY(__stext) SSYNC; #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); diff --git a/arch/blackfin/mach-bf561/head.S b/arch/blackfin/mach-bf561/head.S index 04f3ac33ab0..9c8e6885f4e 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); |