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Gentoo/Grub2 cannot boot Debian on same HDD (hardware reset)
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PostPosted: Thu Apr 23, 2020 1:33 pm    Post subject: Gentoo/Grub2 cannot boot Debian on same HDD (hardware reset) Reply with quote

Following hardware: Old i-core with BIOS (no EFI/UEFI), 6gbit SAS-Card (Intel/LSI),

Disc partitions:
HDD/RAID #0 connected via SAS: partition #1: Windows (NTFS), #2: Debian Wheezy 7 (grub, ext4), #3: Gentoo (grub2,ext4)
HDD1 connected via S-ATA (NTFS data partition)

As long as system was Windows-only, I was able to boot select SAS card as boot device in mainboard BIOS to boot up Windows. Problems started when I installed Debian Wheezy years ago: grub only would start when its MBR was installed on the S-ATA HDD. Same does Gentoo that I added recently as partition #3 on the SAS RAID.

The problem now is:

Booting via grub on Debian, it cannot find Gentoo (probably because newer ext4 functions), but can start Windows+Wheezy.

Booting via grub2 via Gentoo, it finds Debian, Gentoo and Windows, but cannot boot Debian. It just does a hardware reset as soon as it tries to load the kernel.

Booting via Supergrub image from USB, it finds all 3 OS and can boot them properly.

Does anyone know what is the problem here? Is there any USE flag I have to add? Gentoo configuration is Grub2.0.4 and Kernel 5.4.32 from gentoo-kernel-bin.
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