Blackfin arch: document why we have to touch the UART peripheral in our boot up code

[linux-2.6] / arch / blackfin / mach-bf537 / head.S

diff --git a/arch/blackfin/mach-bf537/head.S b/arch/blackfin/mach-bf537/head.S
index aafc686749ed292087654a102e73626019f508d0..b4377dddc127fd5e346e483123cd4b77dbff9243 100644 (file)
--- 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);