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Remote dedicated HP server iLO web interface off the remote management module allowed me access as a local user but I lacked administrator privilege to modify the boot order --or to select legacy over default efi.

Hence, I created a small 200MB JFS partion on second hard drive. Then I copied over Metztli Reiser4 --which downloads Linux kernel 5.0.15 and which .config I modified for AMD Ryzen CPUs.

Selected to install Debian Buster to NVMe reiser4 -formatted root fs on /dev/nvme0n1p5

Below is the tepito [snippet] that I wrote into /etc/grub.d/40_custom file to boot Metztli Reiser4:

menuentry 'Metztli Reiser4 Expert Chingon Buster AMD Epyc install' {

set isofile='metztli-reiser4-z.iso'

insmod gzio

insmod part_gpt

insmod jfs

insmod loopback

loopback loop (hd0,gpt1)/ISOs/$isofile

linux (loop)/linux priority=low vga=788 ---

initrd (loop)/initrd.gz

}

then executed (wielding root privilege): update-grub

See prior reference: Boot Metztli Reiser4 Netboot On Bare Metal Directly From Second Hard Disk When No CDROM Is Available.

Odd that GRUB does not count NVMe as hd0 --seems that 'honor' is reserved to /dev/sda in the two(2) disk setup HP Proliant Gen10 provisioned for me.

Continue reading Metztli Reiser4 successful install on HP ProLiant DL325 Gen10 AMD EPYC 7351P 16-Core Processor, 2 threads per core at Metztli blog...