Messages in this thread Patch in this message | | | From | Bryan Wu <> | Subject | [PATCH 19/32] Blackfin arch: document why we have to touch the UART peripheral in our boot up code | Date | Mon, 21 May 2007 18:09:27 +0800 |
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From: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> --- arch/blackfin/mach-bf533/head.S | 3 ++- arch/blackfin/mach-bf537/head.S | 3 ++- 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 1a54ff5..4db9e62 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 aafc686..b4377dd 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 04f3ac3..9c8e688 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); -- 1.5.1.2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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