Blackfin arch: document why we have to touch the UART peripheral in o…

…ur boot up code Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
git-mirror · May 21, 2007 · 5079df9 · 5079df9
1 parent ef9256d
commit 5079df9
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Showing 3 changed files with 6 additions and 3 deletions.
diff --git 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
@@ -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
@@ -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);