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[POWERPC] Early serial debug support for PPC44x

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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>
This commit is contained in:
David Gibson
2007-05-08 12:59:31 +10:00
committed by Paul Mackerras
parent f6dfc80554
commit d9b55a0361
9 changed files with 97 additions and 26 deletions
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22
arch/powerpc/Kconfig.debug
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@ -139,10 +139,6 @@ config BOOTX_TEXT
Say Y here to see progress messages from the boot firmware in text
mode. Requires either BootX or Open Firmware.
config SERIAL_TEXT_DEBUG
bool "Support for early boot texts over serial port"
depends on 4xx
config PPC_EARLY_DEBUG
bool "Early debugging (dangerous)"
@ -207,6 +203,24 @@ config PPC_EARLY_DEBUG_BEAT
help
Select this to enable early debugging for Celleb with Beat.
config PPC_EARLY_DEBUG_44x
bool "Early serial debugging for IBM/AMCC 44x CPUs"
depends on 44x
select PPC_UDBG_16550
help
Select this to enable early debugging for IBM 44x chips via the
inbuilt serial port.
endchoice
config PPC_EARLY_DEBUG_44x_PHYSLOW
hex "Low 32 bits of early debug UART physical address"
depends PPC_EARLY_DEBUG_44x
default "0x40000200"
config PPC_EARLY_DEBUG_44x_PHYSHIGH
hex "EPRN of early debug UART physical address"
depends PPC_EARLY_DEBUG_44x
default "0x1"
endmenu