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| author | Michal Simek <monstr@monstr.eu> | 2011-04-04 15:45:06 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2011-07-25 09:23:47 +0200 |
| commit | e721a45fbed13a52093d2cc1962dbb8a754462ea (patch) | |
| tree | e4796291b72cdad4d7b64e1c9d19269008005fa8 /arch/microblaze/include/asm/setup.h | |
| parent | microblaze: Standardise cpuinfo output for cache policy (diff) | |
| download | linux-e721a45fbed13a52093d2cc1962dbb8a754462ea.tar.xz linux-e721a45fbed13a52093d2cc1962dbb8a754462ea.zip | |
microblaze: Get early printk console earlier
1. Register early console as standard console
2. Enable CON_BOOT console flag to ensure auto-unregistering by the kernel
3. remap_early_printk function remap physical console baseaddr to virtual space
Usage specific function for console remap is done after memory initialization
with IRQ turn off that's why there is not necessary to protect it.
The reason for remapping is that the kernel use TLB 63 for 1:1 address mapping
to be able to use console in very early boot-up phase. But allocating one TLB
just for console caused performance degression that's why ioremaps create new
mapping and TLB 63 is automatically released and ready to use.
Signed-off-by: Michal Simek <monstr@monstr.eu>
CC: Russell King <linux@arm.linux.org.uk>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: Ingo Molnar <mingo@redhat.com>
CC: Alan Cox <alan@linux.intel.com>
CC: <linux-serial@vger.kernel.org>
CC: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/microblaze/include/asm/setup.h')
| -rw-r--r-- | arch/microblaze/include/asm/setup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/setup.h b/arch/microblaze/include/asm/setup.h index 8f3968971e4e..904e5ef6a11b 100644 --- a/arch/microblaze/include/asm/setup.h +++ b/arch/microblaze/include/asm/setup.h @@ -23,6 +23,7 @@ extern char cmd_line[COMMAND_LINE_SIZE]; void early_printk(const char *fmt, ...); int setup_early_printk(char *opt); +void remap_early_printk(void); void disable_early_printk(void); #if defined(CONFIG_EARLY_PRINTK) |