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| author | Catalin Marinas <catalin.marinas@arm.com> | 2012-10-23 15:55:08 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-01-22 18:51:01 +0100 |
| commit | 2475ff9d2c6ea3bbfed55c4635426c371f9ad327 (patch) | |
| tree | c705c9a55b2d9ea2d270b7002f568b6be0465ecd /Documentation | |
| parent | arm64: Populate the platform devices (diff) | |
| download | linux-2475ff9d2c6ea3bbfed55c4635426c371f9ad327.tar.xz linux-2475ff9d2c6ea3bbfed55c4635426c371f9ad327.zip | |
arm64: Add simple earlyprintk support
This patch adds support for "earlyprintk=" parameter on the kernel
command line. The format is:
earlyprintk=<name>[,<addr>][,<options>]
where <name> is the name of the (UART) device, e.g. "pl011", <addr> is
the I/O address. The <options> aren't currently used.
The mapping of the earlyprintk device is done very early during kernel
boot and there are restrictions on which functions it can call. A
special early_io_map() function is added which creates the mapping from
the pre-defined EARLY_IOBASE to the device I/O address passed via the
kernel parameter. The pgd entry corresponding to EARLY_IOBASE is
pre-populated in head.S during kernel boot.
Only PL011 is currently supported and it is assumed that the interface
is already initialised by the boot loader before the kernel is started.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm64/memory.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index d758702fc03c..5f583af0a6e1 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -35,6 +35,8 @@ ffffffbc00000000 ffffffbdffffffff 8GB vmemmap ffffffbe00000000 ffffffbffbbfffff ~8GB [guard, future vmmemap] +ffffffbffbc00000 ffffffbffbdfffff 2MB earlyprintk device + ffffffbffbe00000 ffffffbffbe0ffff 64KB PCI I/O space ffffffbbffff0000 ffffffbcffffffff ~2MB [guard] |