tree 230517a472a3fd7487f649901bb162b67f9e4131
parent 24ed9c7fcc5bd79b7d69b6d725816fb5eace6e08
author Adriana Kobylak <anoo@us.ibm.com> 1597686023 -0500
committer Andrew Geissler <geissonator@yahoo.com> 1597964413 -0500

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)

(From meta-phosphor rev: b7dccc1c380431f4cc96e0228fb9975d33df1f88)

Change-Id: I625a879882311285dbdeaa2ea271c379366f4b9b
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>