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@roykAfter many hours, what fixed my issue is reverting to an older kernel . Indeed it seems 6.1.75-vendor-rk35xx might have issue with nvme / pcie and so the penthat the solution that worked was downgrading to the 24.8.2 version of the kernel : sudo apt install linux-dtb-vendor-rk35xx=24.8.2 linux-image-vendor-rk35xx=24.8.2 reboot for reference the solution found was in this post https://forum.armbian.com/topic/46624-atp-update-changed-kernel-from-6106-current-rockchip-rk3588-to-6175-vendor-rk35xx-and-failed/ Thank you Royk for your kind help and suggestions ! it made me read / learn alot but alos helped continue to look further.

didnt update any thing, and just for the record, the emmc is not soldered and i flashed it using belena etcher. I have donne the steps in the link, and i manage to boot from the emmc, but as before the pentahat is not detected / working. here are the results of the dmesg | grep pci when booting from the sd card here are the results of the dmesg | grep pci when booting from the emmc there is a discrepency between the two and considering the pentaHat connects the ssd via pcie maybe it could explain why the disk are not recognize ?

indeed it is not the case. After further reading, their is no spi flash memory on radxa rock 5c i have attached a some lsblk results depending on where i boot and which image. and as i am searching for solution i found this post : https://forum.radxa.com/t/spi-loader-for-rock-5c-lite/21149 but i unsure it is of any help not i understand how i could try updating the spl loader radxa-troubleshooting.md

I tried updating the bootloader without much sucess, Another clue is that when i update the radxa os on the emmc (apt update && apt upgrade) then the pentaHat do not work anymore. As their is a conflict between emmc and pcie lane used by the hat ?

Login, type "sudo armbianmonitor -u" and copy the URL here. the command failed with the following error : /usr/bin/armbianmonitor: ligne 976: iostat : commande introuvable img used : Armbian_24.8.4_Rock-5c_bookworm_vendor_6.1.75-omv_minimal.img.xz hardware : https://docs.radxa.com/en/accessories/penta-sata-hat https://docs.radxa.com/en/rock5/rock5c 4 ssd samasung evo 870 The image works perfectly when flashed on a SD card and booting from the SD card, the Radxa pentaHat works, the disk are powered (green led for the hat, blue led per each disk). However, when the image is flashed on emmc, the OS boot normaly but the pentaHat does not work, the disk are not powered and not detected by the os (green led Ok, no blue led for the disk) Does any of you have an idea why it works using the SD card and not with the emmc ? is their some settings or overlay that could help fix this issue. I tried the radxa img for the rock5c and it works with either emmc or sd card (https://github.com/radxa-build/rock-5c/releases) Thank you for your answers and help!