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

[linux-2.6] / arch / blackfin / mach-bf533 / head.S

diff --git a/arch/blackfin/mach-bf533/head.S b/arch/blackfin/mach-bf533/head.S
index 1a54ff5f061d239f6b5389964ad2a3fe15e01ce6..4db9e62409064268f7e3f9fa0a96684ff852cd95 100644 (file)
--- 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);