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    Subject[PATCH 19/32] Blackfin arch: document why we have to touch the UART peripheral in our boot up code
    Date
    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
    -
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