Installation of ppc64le Red Hat OpenShift Container Platform 4.4 fails with error "coreos-installer[834]: failed mounting boot partition"

Issue

• The ppc64le Red Hat OpenShift Container Platform 4.4 fails with the errors below post downloading ignition config while writing down the image to the disk.

[    3.402836] localhost kernel: scsi 0:0:1:0: CD-ROM            AIX      VOPTA                 PQ: 0 ANSI: 4
[    3.403074] localhost kernel: scsi 0:0:2:0: CD-ROM            AIX      VOPTA                 PQ: 0 ANSI: 4
[    3.403362] localhost kernel: scsi 0:0:3:0: Direct-Access     AIX      VDASD            0001 PQ: 0 ANSI: 3
[    3.403634] localhost kernel: scsi 0:0:4:0: Direct-Access     AIX      VDASD            0001 PQ: 0 ANSI: 3
[............]
[    3.479148] localhost kernel: scsi 0:0:1:0: Attached scsi generic sg0 type 5
[    3.479194] localhost kernel: scsi 0:0:2:0: Attached scsi generic sg1 type 5
[    3.479245] localhost kernel: scsi 0:0:3:0: Attached scsi generic sg2 type 0
[    3.479292] localhost kernel: scsi 0:0:4:0: Attached scsi generic sg3 type 0
[    3.489000] localhost kernel: sr 0:0:1:0: [sr0] scsi-1 drive
[    3.489002] localhost kernel: cdrom: Uniform CD-ROM driver Revision: 3.20
[    3.489682] localhost kernel: sr 0:0:1:0: Attached scsi CD-ROM sr0
[    3.489807] localhost kernel: sr 0:0:2:0: [sr1] scsi-1 drive
[    3.490444] localhost kernel: sr 0:0:2:0: Attached scsi CD-ROM sr1
[    3.503723] localhost kernel: sd 0:0:3:0: [sda] 20971520 4096-byte logical blocks: (85.9 GB/80.0 GiB)
[    3.503760] localhost kernel: sd 0:0:3:0: [sda] Write Protect is off
[    3.503762] localhost kernel: sd 0:0:3:0: [sda] Mode Sense: 17 00 00 08
[    3.503766] localhost kernel: sd 0:0:4:0: [sdb] 15728640 4096-byte logical blocks: (64.4 GB/60.0 GiB)
[    3.503810] localhost kernel: sd 0:0:4:0: [sdb] Write Protect is off
[    3.503811] localhost kernel: sd 0:0:3:0: [sda] Cache data unavailable
[    3.503812] localhost kernel: sd 0:0:3:0: [sda] Assuming drive cache: write through
[    3.503814] localhost kernel: sd 0:0:4:0: [sdb] Mode Sense: 17 00 00 08
[    3.503859] localhost kernel: sd 0:0:4:0: [sdb] Cache data unavailable
[    3.503862] localhost kernel: sd 0:0:4:0: [sdb] Assuming drive cache: write through
[    3.505518] localhost kernel: sd 0:0:3:0: [sda] Attached SCSI disk
[    3.505923] localhost kernel: sd 0:0:4:0: [sdb] Attached SCSI disk
[............]
[   77.728156] bootstrap coreos-installer[834]: 99%
[   78.730296] bootstrap coreos-installer[834]: Wiping /dev/sda
[   78.738199] bootstrap coreos-installer[834]: Writing disk image
[  109.432912] bootstrap coreos-installer[834]: Waiting for udev
[  109.530585] bootstrap coreos-installer[834]: Embedding provided Ignition config
[  109.536003] bootstrap coreos-installer[834]: mount: /mnt/boot_partition: no filesystem type specified.
[............]
[  138.686467] bootstrap coreos-installer[834]: mount: /mnt/boot_partition: no filesystem type specified.
[  139.691554] bootstrap coreos-installer[834]: mount: /mnt/boot_partition: no filesystem type specified.
[  139.692050] bootstrap coreos-installer[834]: failed mounting boot partition

• The disk types are SATA, but not nvme.