patch-2.4.19 linux-2.4.19/arch/arm/kernel/debug-armv.S

• Lines: 57
• Date: Fri Aug 2 17:39:42 2002
• Orig file: linux-2.4.18/arch/arm/kernel/debug-armv.S
• Orig date: Thu Oct 25 13:53:45 2001

diff -urN linux-2.4.18/arch/arm/kernel/debug-armv.S linux-2.4.19/arch/arm/kernel/debug-armv.S
@@ -164,28 +164,49 @@
 		.endm
 
 #elif defined(CONFIG_ARCH_SA1100)
+
 		.macro	addruart,rx
 		mrc	p15, 0, \rx, c1, c0
 		tst	\rx, #1			@ MMU enabled?
 		moveq	\rx, #0x80000000	@ physical base address
 		movne	\rx, #0xf8000000	@ virtual address
-		@add	\rx, \rx, #0x00050000	@ Ser3
-		add	\rx, \rx, #0x00010000	@ Ser1
+
+		@ We probe for the active serial port here, coherently with
+		@ the comment in include/asm-arm/arch-sa1100/uncompress.h.
+		@ We assume r1 can be clobbered.
+
+		@ see if Ser3 is active
+		add	\rx, \rx, #0x00050000
+		ldr	r1, [\rx, #UTCR3]
+		tst	r1, #UTCR3_TXE
+
+		@ if Ser3 is inactive, then try Ser1
+		addeq	\rx, \rx, #(0x00010000 - 0x00050000)
+		ldreq	r1, [\rx, #UTCR3]
+		tsteq	r1, #UTCR3_TXE
+
+		@ if Ser1 is inactive, then try Ser2
+		addeq	\rx, \rx, #(0x00030000 - 0x00010000)
+		ldreq	r1, [\rx, #UTCR3]
+		tsteq	r1, #UTCR3_TXE
+
+		@ if all ports are inactive, then there is nothing we can do
+		moveq	pc, lr
 		.endm
 
 		.macro	senduart,rd,rx
-		str	\rd, [\rx, #0x14]	@ UTDR
+		str	\rd, [\rx, #UTDR]
 		.endm
 
 		.macro	waituart,rd,rx
-1001:		ldr	\rd, [\rx, #0x20]	@ UTSR1
-		tst	\rd, #1 << 2		@ UTSR1_TNF
+1001:		ldr	\rd, [\rx, #UTSR1]
+		tst	\rd, #UTSR1_TNF
 		beq	1001b
 		.endm
 
 		.macro	busyuart,rd,rx
-1001:		ldr	\rd, [\rx, #0x20]	@ UTSR1
-		tst	\rd, #1 << 0		@ UTSR1_TBY
+1001:		ldr	\rd, [\rx, #UTSR1]
+		tst	\rd, #UTSR1_TBY
 		bne	1001b
 		.endm