meta-tegra: tegra-minimal-init: nvme + sda boot problems

[otukka]

Problem
I’m using a Seeed Studio J3011 with an internal NVMe drive. Occasionally, I want to test booting from a USB HDD. However, the minimal init script sources /etc/platform-preboot, which always detects the NVMe drive first and selects it as the boot device. This behavior makes it difficult to boot from USB when needed.

Current workaround
As a workaround, I created a patch that overrides the sourcing of /etc/platform-preboot and defined UBOOT_EXTLINUX_KERNEL_ARGS to control the boot device manually.

Questions
Is there a way to support this setup without relying on patches? For example, could TNSPEC_BOOTDEV be used for this purpose, since it is already defined in this scenario?

[madisongh]

We already have logic in the platform-preboot script based off TNSPEC_BOOTDEV, since commit 56ed0e7

[otukka]

@madisongh that is correct if I wouldn't have nvme installed. Now it will fill rootdev earlier on that script and never goes to that branch

meta-tegra/recipes-core/initrdscripts/tegra-minimal-init/platform-preboot.sh

Line 25 in ad302bb

rootdev=`blkid -l -t PARTLABEL=APP$slotsfx | cut -d: -f1`

[madisongh]

Right, the logic should probably be extended to specifying the TNSPEC_BOOTDEV device name on that blkid command also.

[madisongh]

@otukka Take a look at #2186 , see if that covers your use case