[RFC PATCH v2 0/3] Introduce global.bootm.root_dev env var for booting via PARTUUID

[Robert Karszniewicz]

This patch introduces a new env var which specifies which device is the
rootfs device to be used in Linux, passed to Linux via bootargs,
identified by the rootfs partition's PARTUUID.

global.bootm.root_dev supplements global.bootm.appendroot, in that it
overrides appendroot's naïve default, which picks the partition that the
kernel resides on (global.bootm.image).

Example:
detect mmc2
global.bootm.image='/mnt/mmc2.0/zImage'
global.bootm.appendroot=1
global.bootm.root_dev=/dev/mmc2.1
boot mmc

For proper patch, I would squash all commits.

Changes from v1:
- renamed env var s/root/root_dev/
- used filesystem-agnostic approach (root_dev now takes a /dev/ instead
  of a mounted partition)

Robert Karszniewicz (3):
  bootm: add env var root_dev
  globalvar: add bootm.root_dev
  bootm: handle global.bootm.root_dev

 common/bootm.c  | 18 ++++++++++++++++--
 include/bootm.h |  2 ++
 2 files changed, 18 insertions(+), 2 deletions(-)

-- 
2.7.4