Hello,

is there, by any chance, someone with a rhel/centos 8.2.2004 (using kernel 
version 4.18.0-193.6.3.el8_2.x86_64)
successfully booting in UEFI mode ? I'm running xcat 2.16.

I'm using 4.18.0-147.8.1 from CentOS 8.1.1911:

/tftpboot/xcat/osimage/netboot-cpu-centos8.1/kernel: Linux kernel x86 boot 
executable bzImage, version
4.18.0-147.8.1.el8_1.x86_64 (mockbu...@kbuilder.bsys.centos.org) #1 SMP Thu Apr 
9 13:49:54 UTC , RO-rootFS, swap_dev
0x7, Normal VGA

and 4.18.0-193.6.3 from CentOS 8.2.2004:

/tftpboot/xcat/osimage/netboot-cpu-centos8.2/kernel: Linux kernel x86 boot 
executable bzImage, version
4.18.0-193.6.3.el8_2.x86_64 (mockbu...@kbuilder.bsys.centos.org) #1 SMP Wed Jun 
10 11:09:32 UTC, RO-rootFS, swap_dev
0x8, Normal VGA

Here is what I've got using 8.2.2004 during the initial PXE phase:

==============================
xCAT Network Boot Agent
iPXE 1.0.3-131028 (d603e) -- Open Source Network Boot Firmware -- 
http://ipxe.org
Features: HTTP HTTPS iSCSI DNS TFTP EFI
net0: ac:1f:6b:c8:ee:10 using <NULL> on EFI SNP (open)
  [Link:up, TX:0 TXE:0 RX:0 RXE:0]
DHCP (net0 ac:1f:6b:c8:ee:10)... ok
net0: 192.168.152.2/255.255.240.0 gw 192.168.144.1
Next server: 192.168.148.10
Filename: http://192.168.148.10:80/tftpboot/xcat/xnba/nodes/maestro-1000.uefi
http://192.168.148.10:80/tftpboot/xcat/xnba/nodes/maestro-1000.uefi... ok
http://192.168.148.10:80/tftpboot/xcat/elilo-x64.efi... ok
ELILO v3.14 for EFI/x86_64
Loading kernel /tftpboot/xcat/osimage/netboot-cpu-centos8.2/kernel...  done
Loading file 
/tftpboot/xcat/osimage/netboot-cpu-centos8.2/initrd-stateless.gz...done
==============================

It stops here, and it reboots.

Here is the xcatprobe corresponding output:

==============================
[maestro-1000] 00:15:07 Via HTTP get /tftpboot/xcat/xnba/nodes/maestro-1000.uefi
[maestro-1000] 00:15:08 Via HTTP get /tftpboot/xcat/elilo-x64.efi
[maestro-1000] 00:15:08 Via HTTP get 
/tftpboot/xcat/xnba/nodes/maestro-1000.elilo
[maestro-1000] 00:15:08 Via HTTP get 
/tftpboot/xcat/osimage/netboot-cpu-centos8.2/kernel
[maestro-1000] 00:15:08 Via HTTP get 
/tftpboot/xcat/osimage/netboot-cpu-centos8.2/initrd-stateless.gz
==============================

If I replace the kernel (/tftpboot/xcat/osimage/netboot-cpu-centos8.2/kernel) 
with the kernel from 8.1
(/tftpboot/xcat/osimage/netboot-cpu-centos8.1/kernel) using cp, it boots.

Does it ring a bell to somebody ? We are using Supermicro AS-2124BT-HNTR with 2 
x AMD EPYC 7552 48-Core Processor.

Any suggestions on where to start to debug the problem ?

Thank you for your help,

Jean-Baptiste


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