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The use MBOX protocol to request flash access from the BMC. Then
read/write to the 'flash' through windows it creates on LPC FW space.
Reference implementation of the mbox flash daemon for BMC userspace:
https://github.com/cyrilbur-ibm/mboxbridge
Signed-off-by: Cyril Bur <cyril.bur@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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libflash core is really good at accessing hardware flash devices. libffs is
really good at read FFS partitioned data and has been designed to use libflash
to read data.
Problems arise when FFS partitioned data exists on something other than
flash hardware, or the hardware cannot be accessed directly.
This interface should bridge the gap, allowing libffs to be used no matter
what the backing is for the data. This should allow for greater flexibility
for reading and writing, such as adding support read-only areas at a global
level as well as more straight forward usage of libffs for userspace bypassing
libflash entirely.
Signed-off-by: Cyril Bur <cyril.bur@au1.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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Add ECC checking code. This code is based on the hostboot code.
Unused currently, but will be soon. This uses __builtin_parityl() hence adding
libgcc linking previously.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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