rEFInd, boot problem with OS on SD-card

[facciofinta]

Hi, I need to add an option on rEFInd in order to boot on a SparkyLinux installed on a SD-card.

I've tried but there is a mistake which I cannot find.


What I did


I've search for the right partition, where refind.conf is located:

In terminal I wrote

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sudo parted -l
And I found:

Model: ATA SAMSUNG SSD PM85 (scsi)

Disk /dev/sda: 256GB [...]

Number; 2, [...] Size: 105MB, File system fat32, Name: EFI system partition, Flags: boot, esp

Then:

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sudo mkdir /mnt/efi

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sudo mount /dev/sda2 /mnt/efi

and there I found the refind.conf


I looked for the SDA partition:

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lsblk
and I found that the right partition is mmcblk0p1

NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT

sda           8:0    0 238,5G  0 disk

├─sda1        8:1    0   300M  0 part

├─sda2        8:2    0   100M  0 part

├─sda3        8:3    0   128M  0 part

├─sda4        8:4    0  68,6G  0 part

├─sda5        8:5    0   1,9G  0 part [SWAP]

├─sda6        8:6    0 115,8G  0 part /

└─sda7        8:7    0  51,8G  0 part

mmcblk0     179:0    0  29,8G  0 disk

├─mmcblk0p1 179:1    0  28,9G  0 part

├─mmcblk0p2 179:2    0     1K  0 part

└─mmcblk0p5 179:5    0   975M  0 part


I've searched for .img and vmlinux in that partition:

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sudo mount /dev/mmcblk0p1 /mnt
and there I found the /boot/initrd.img and the /boot/vmlinuz

and I typed on terminal

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sudo blkid /dev/mmcblk0p1
and I found:

/dev/mmcblk0p1: UUID="4e0f44cd-99ff-4c8d-a12b-4c02f0a4ee44" TYPE="ext4" PARTUUID="579341c5-01"


I've tried to insert in the refind.conf

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menuentry "Sparky GNU/Linux SD" {

    icon /EFI/refind/icons/os_linux.png

    volume "Sparky GNU/Linux SD"

    loader /boot/vmlinuz-6.1.0-25-amd64

    initrd /boot/initrd.img-6.1.0-25-amd64

    options "root=/dev/mmcblk0p1 ro"

}

or

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menuentry "Sparky GNU/Linux" {

    icon /EFI/refind/icons/os_linux.png

    volume "Sparky GNU/Linux"

    loader /boot/vmlinuz-6.1.0-25-amd64

    initrd /boot/initrd.img-6.1.0-25-amd64

    options "root=UUID=4e0f44cd-99ff-4c8d-a12b-4c02f0a4ee44 ro"

}

but the result was always:

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using load option... invalid loader. File not found while loading vmlinuz-6.1.0-25-amd64