rEFInd, boot problem with OS on SD-card

[c-sharp]

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

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:

sudo mkdir /mnt/efi

sudo mount /dev/sda2 /mnt/efi

and there I found the refind.conf

I looked for the SDA partition:

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:

sudo mount /dev/mmcblk0p1 /mnt

and there I found the /boot/initrd.img and the /boot/vmlinuz
and I typed on terminal

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

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

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:

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