tree 3c6ae8f5d4dfd1460d2e93901e15b789160f6c57
parent 797190a9319f484612a0e37261033d00cd2401f1
author Adriana Kobylak <anoo@us.ibm.com> 1597686023 -0500
committer Brad Bishop <bradleyb@fuzziesquirrel.com> 1597931511 +0000

mmc-init.sh: Wait for mmc device

The initramfs was accessing the mmc device before it was probed
in some cases, leading to this error message:

[    4.412464] mmcblk0rpmb: mmc0:0001 R1J56L partition 3 128 KiB, chardev (248:0)
tail: can't open '/dev/mmcblk0': No such file or directory
tail: no files
[    5.471158]  mmcblk0: p1 p2 p3 p4 p5 p6 p7

Implement a wait loop of up to 5s to wait for the device,
similar to what the kernel would do with rootwait.

Tested: Verified the error is not longer seen. Printing the count
        value as debug, it took one sleep iteration to appear:

[    4.396492] mmcblk0boot1: mmc0:0001 R1J56L partition 2 16.0 MiB
0
[    4.403500] mmcblk0rpmb: mmc0:0001 R1J56L partition 3 128 KiB, chardev (248:0)
[    4.416176]  mmcblk0: p1 p2 p3 p4 p5 p6 p7
1
[    6.159693] EXT4-fs (mmcblk0p4): mounted filesystem with ordered data mode. Opts: (null)

Change-Id: Ib435932dacdc6310788fe28b97c40d47c6c47e1b
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>