Enable TWRP to reside alongside other recoveries with the naming
convention: bootable/recovery(-flag). If TWRP resides at
bootable/recovery and a device does not specify RECOVERY_VARIANT, then
it will build like normal. If TWRP resides at bootable/recovery-twrp,
then its makefiles will only be parsed if a device specifies
'RECOVERY_VARIANT := twrp'. This prevents TWRP specific makefile
warnings/errors (notably, missing DEVICE_RESOLUTION) when another
recovery is being built.
Change-Id: I8f02fffcd79c309c7123b9428eedc69af02e126e
Due to a kernel bug and no available sources we have to work around the
MEMERASE ioctl - if used, it hangs and never returns. I straced the original
recovery executable and could see that it is simply calling write() with a
bunch of zeroes instead of using MEMERASE.
Added a hack that does the same and now the resulting TWRP recovery image works.
Change-Id: I1b1c1c9e870e350776346bdca5d442c7ef565aa0
With the recovery image being installed by applypatch, the flash_image
tool isn't needed any more. Continue to build it for eng just in case
it's handy for debugging.
