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

[linux-2.6] / arch / blackfin / mach-bf561 / head.S

diff --git a/arch/blackfin/mach-bf561/head.S b/arch/blackfin/mach-bf561/head.S
index 04f3ac33ab0efd5ec12c38fe3a73843decf9b6f6..9c8e6885f4e7f1dea40353cb7620fa4b59dd31d8 100644 (file)
--- 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);