commit d9b55a03611ff2e2e54fb4e1ad2648d5eb870fa3
author David Gibson <david@gibson.dropbear.id.au> Tue May 08 12:59:31 2007 +1000
committer Paul Mackerras <paulus@samba.org> Tue May 08 14:47:33 2007 +1000
tree 5704be539afcd6f29b1f5751476c8b4f53673bff
parent f6dfc80554b27da11dbb36ebae166b23ec3aa9ca

[POWERPC] Early serial debug support for PPC44x

This adds support for early serial debugging via the built in
port on IBM/AMCC PowerPC 44x CPUs.  It uses a bolted TLB entry in
address space 1 for the UART's mapping, allowing robust debugging both
before and after the initialization of the MMU.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-powerpc/mmu-44x.h

diff --git a/include/asm-powerpc/mmu-44x.h b/include/asm-powerpc/mmu-44x.h
index 7bbc37e..d5ce7a8 100644
--- a/include/asm-powerpc/mmu-44x.h
+++ b/include/asm-powerpc/mmu-44x.h
@@ -64,7 +64,13 @@
 
 #endif /* !__ASSEMBLY__ */
 
+#ifndef CONFIG_PPC_EARLY_DEBUG_44x
 #define PPC44x_EARLY_TLBS	1
+#else
+#define PPC44x_EARLY_TLBS	2
+#define PPC44x_EARLY_DEBUG_VIRTADDR	(ASM_CONST(0xf0000000) \
+	| (ASM_CONST(CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW) & 0xffff))
+#endif
 
 /* Size of the TLBs used for pinning in lowmem */
 #define PPC_PIN_SIZE	(1 << 28)	/* 256M */