Samsung Galaxy Core Prime VE LTE (samsung-coreprimevelte)

Mainline
Kernel tree with very basic support is available here.



Apparently, the PXA1908 chipset is also known as IAP140, as you can see here.

Downstream
It's possible to compile the Samsung-provided downstream kernel with some config changes ( should be used as a defconfig):

should be set, and  should be unset. These are required by postmarketOS.

should be set, or the boot image will be too big for the partition.

The concatenated dtb blob should be generated with https://github.com/osm0sis/pxa-mkbootimg, because the G361F's chipset is a bit different.

Flashing
The device can be put in flashing mode by powering it on while pressing the POWER + HOME + VOLUME DOWN buttons simultaneously, and answering the appearing question by pressing VOLUME UP.

As of now,  works correctly, but   errors out with. As some Samsung devices seem to check whether the flashed payload is valid, it's possible that the device denies the image because of the "weird" partitioning scheme (the system image is partitioned into two filesystems).

Flashing via recovery zip works.

Booting
The SM-G361F uses the Marvell PXA1908 chipset, which uses a nonstandard boot.img and dtb format, handled by pxa-mkbootimg.

Additionally, the device requires a legacy U-Boot kernel image as the kernel in boot.img, with a quirk: the image name must be exactly. With this parameter overridden, the device boots successfully into the postmarketOS kernel, and USB networking is available, however it automatically reboots after around 3-4 minutes of uptime. This is yet to be investigated.

UART
UART over the microUSB connector can be enabled by putting a 150K or 619K resistor between the ID and GND pins. The device TX will be on the D- pin, and RX will be on the D+ pin. A 619K will power on the device as soon as the UART cable is connected, while a 150K won't. Signal level is 1.8V.