After quite 10 years of whist it seems that everything became harder. For example: it was necessary to change my old linux server which serve my e-mails, web pages, files, etc. But nowadays
impossible to buy a motherboard with quite new low-power processor - there are many, but or without a SATA port or just one. So after weeks of hesitation, I bought an Asus Lockerstore Gen2 AS6704T NAS device,
with Jasper Lake 5105 processor, 4 SATA removable bay, 4 NVME M2.slot, 2 2.5G LAN etc. So far so good, but I cannot and don't want use the operating system Asus offer, not just for its simplicity, but I must retain my operating system and services - and
the contents of the old machine RAID disks without enough room to copy.
Beginning of the process easy: on the bios (F2 key after reset) you can change the boot order, placing the EMMC boot as last resort. After that the operating system can start -
in the case if it is an UEFI one. Because the low M.2 Nvme prices I'm already bought two 256G card ( and an additional 4G of compatible DDR4 RAM), so after boot from a UEFI drive, created an LVM raid from the two nvme and copy the operating system to it ( as I remember, using Nvme drives with pure mdadm is not so good).
After change /etc/fdisk to contain my old RAID parameters (the BIG partition, everything except the operating system), the system works as before.
Good - but this is a special device, which contains a 2x16 character display, five button, and a couple of special GPIO leds and pwm FAN controlled by the IT8625E superio chip.
None working.
After some research found the following source: asustor-platform-driver - it is for the old NAS versions AS604T and AS6204T so impossible to use because the hardware incompatibility, but a good
point to start. The first step was to identify the device for the module loading( digging the DMI info found the vendor: "Intel Corporation" and product name: "Jasper Lake Client Platform".
Now the driver start, but there was just some info in /sys/class/hwmon/hwmon3 , for ex. there was no pwm fan setting. Long story short, there is an abandoned and reopened it87 driver on the kernel (which knows nothing about the IT8625E). It must disable and implement a new
modified asustor-gpio.ko driver (derived from original it87-gpio) solved the problem, and after probing the gpios I found all the GPIOs on the superio chip.
The list ( /sys/class/gpio contains 2 directories: the chip 0: gpiochip684 contains 340 gpio and chip 1: gpiochip620 contains 64 gpio, this is the IT8625E, so to the numbers below add 620 to export):