From d9b55a03611ff2e2e54fb4e1ad2648d5eb870fa3 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 8 May 2007 12:59:31 +1000 Subject: [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 Signed-off-by: Paul Mackerras --- include/asm-powerpc/mmu-44x.h | 6 ++++++ include/asm-powerpc/udbg.h | 1 + 2 files changed, 7 insertions(+) (limited to 'include/asm-powerpc') diff --git a/include/asm-powerpc/mmu-44x.h b/include/asm-powerpc/mmu-44x.h index 7bbc37e27d3..d5ce7a8dfe9 100644 --- a/include/asm-powerpc/mmu-44x.h +++ b/include/asm-powerpc/mmu-44x.h @@ -64,7 +64,13 @@ typedef struct { #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 */ diff --git a/include/asm-powerpc/udbg.h b/include/asm-powerpc/udbg.h index d03d8557f70..ce9d82fb7b6 100644 --- a/include/asm-powerpc/udbg.h +++ b/include/asm-powerpc/udbg.h @@ -47,6 +47,7 @@ extern void __init udbg_init_rtas_panel(void); extern void __init udbg_init_rtas_console(void); extern void __init udbg_init_debug_beat(void); extern void __init udbg_init_btext(void); +extern void __init udbg_init_44x_as1(void); #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_UDBG_H */ -- cgit v1.2.3