#SPI drivers
menuconfig SND_SPI
bool "SPI sound devices"
depends on SPI
default y
help
Support for sound devices connected via the SPI bus.
if SND_SPI
config SND_AT73C213
tristate "Atmel AT73C213 DAC driver"
depends on ATMEL_SSC
select SND_PCM
help
Say Y here if you want to use the Atmel AT73C213 external DAC. This
DAC can be found on Atmel development boards.
This driver requires the Atmel SSC driver for sound sink, a
peripheral found on most AT91 and AVR32 microprocessors.
To compile this driver as a module, choose M here: the module will be
called snd-at73c213.
config SND_AT73C213_TARGET_BITRATE
int "Target bitrate for AT73C213"
depends on SND_AT73C213
default "48000"
range 8000 50000
help
Sets the target bitrate for the bitrate calculator in the driver.
Limited by hardware to be between 8000 Hz and 50000 Hz.
Set to 48000 Hz by default.
endif # SND_SPI
ame='id' value='c8f325a59cfc718d13a50fbc746ed9b415c25e92'/>
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(),
after which unaligned accesses to RAM are no longer supported.
Commit:
abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
fixed an issue in the memory map handling of the stub FDT code, but
inadvertently created an issue with such firmware, by moving some
of the FDT manipulation to after the invocation of ExitBootServices().
Given that the stub's libfdt implementation uses the ordinary, accelerated
string functions, which rely on hardware handling of unaligned accesses,
manipulating the FDT with the MMU off may result in alignment faults.
So fix the situation by moving the update_fdt_memmap() call into the
callback function invoked by efi_exit_boot_services() right before it
calls the ExitBootServices() UEFI service (which is arguably a better
place for it anyway)
Note that disabling the MMU in ExitBootServices() is not compliant with
the UEFI spec, and carries great risk due to the fact that switching from
cached to uncached memory accesses halfway through compiler generated code
(i.e., involving a stack) can never be done in a way that is architecturally
safe.
Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Riku Voipio <riku.voipio@linaro.org>
Cc: <stable@vger.kernel.org>
Cc: mark.rutland@arm.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: leif.lindholm@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>