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In this patch, we add a utility to disable emulation mode in eMMC-4.5.
This is done to increase the data sector size to 4KB.
Signed-off-by: Saugata Das <saugata.das@linaro.org>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

This adds a new option to enable the boot from eMMC
by writing to the 179 ext_csd register.

The example below shows as to enable the mmcblk0boot0
partition and also set/reset the ACK bit).

$ ./mmc bootpart enable 1 1 /dev/mmcblk0boot0
$ ./mmc extcsd read /dev/mmcblk0boot0 | grep PARTITION_CON
Boot configuration bytes [PARTITION_CONFIG: 0x49]
Reported-by: Youssef TRIKI <youssef.triki@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

This leaves "extcsd read" pointing to Giuseppe's code.  Also, abstract
out the writeprotect code so that there's only one shared implementation
in print_writeprotect_status(), used by both "extcsd read" and
"writeprotect get".
Signed-off-by: Chris Ball <cjb@laptop.org>

This was posted to linux-mmc@ by Johan Rudholm.
Signed-off-by: Chris Ball <cjb@laptop.org>