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Good afternoon.
While booting from iso for further installation of the system, I encountered
the error "Could not allocate memory for RTAS".

The problem is only present in the openSUSE Leap 15.5 ppc64le distribution.
OpenSUSE Leap 15.4 ppc64le does not have this problem.
Of course, on the Internet there was a solution from the equipment
manufacturer.
(https://www.ibm.com/support/pages/could-not-allocate-memory-rtas-grub-or-yaboot-ppcbe)
But it does not help and the error remains.
My opinion is that this is a bug in the distribution, if it is not, please let
me know about it.

Reproducible: Always

Steps to Reproduce:
1.Booting LPAR from CD/DVD openSUSE-Leap-15.5-DVD-ppc64le-Media.iso
2.In the bootloader, select "install operating system"
3.We get an error
Actual Results:  
We get an error
Welcome to GRUB!

search prep from disk
`ieee1275//vdevice/v-s
csi@3000000b/disk@8100000000000000'
error: ../../grub-core/commands/prep_loadenv.c:179:no prep partition.
earlycfg: root=memdisk prefix=(memdisk)/
bdev=ieee1275//vdevice/v-scsi@3000000b/disk@8100000000000000
bpart=,1
bpath=/boot/ppc64le/grub2-ieee1275
Reading vars from (ieee1275//vdevice/v-scsi@3000000b/disk@8100000000000000)
error: ../../grub-core/commands/prep_loadenv.c:179:no prep partition.
ENV_HINT=
ENV_GRUB_DIR=
ENV_FS_UUID=
searching for /boot/ppc64le/grub2-ieee1275/grub.cfg
/boot/ppc64le/grub2-ieee1275/grub.cfg is on
ieee1275//vdevice/v-scsi@3000000b/disk@81000
00000000000,1
prefix=(ieee1275//vdevice/v-scsi@3000000b/disk@8100000000000000,1)/boot/ppc64le
/grub2-ieee1275 root=ieee1275//vdevice/v-scsi@3000000b/disk@8100000000000000,1
Loading kernel ...
Loading initial ramdisk ...
OF stdout device is: /vdevice/vty@30000000
Preparing to boot Linux version 5.14.21-150500.53-default (geeko@buildhost)
(gcc (SUSE Linux) 7.5.0, GNU ld (GNU Binut                                     
                                                                               
 ils; SUSE Linux Enterprise 15) 2.39.0.20220810-150100.7.40) #1 SMP Wed May 10
07:56:26 UTC 2023 (b630043)
Detected machine type: 0000000000000101
command line: BOOT_IMAGE=/boot/ppc64le/linux
Max number of cores passed to firmware: 256 (NR_CPUS = 2048)
Calling ibm,client-architecture-support... done
memory layout at init:
  memory_limit : 0000000000000000 (16 MB aligned)
  alloc_bottom : 000000001fef0000
  alloc_top    : 0000000020000000
  alloc_top_hi : 0000000020000000
  rmo_top      : 0000000020000000
  ram_top      : 0000000020000000
Could not allocate memory for RTAS
EXIT called ok
0 >


Expected Results:  
The system installer is loading

iso SHA-256 checksum - pass
My HW - IBM Power E880
SLES 12SP5 - also not affected by this error.