MNT Pocket Reform

atax1a

atax1a

we've got a Pocket Reform with the i.MX8M+ board, and have tried booting freebsd on it; the kernel appears to run but the screen doesn't light up. where would we start in trying to get this machine working on freebsd? probably getting a console on the UART would be step 1, but from there, i'm kinda lost (most of our experience is in x86 hardware such that the BIOS/UEFI provides the frame buffer)
 
The interface is MIPI and that is not easy. You heard of plug and play. This is exact opposite. Need custom u-boot for uefi framebuffer. Look at PinePhonePro FreeBSD work for DSI and see what you can gleen.
From what i have seen from various Arm board offerings you enable the display via a Device Tree Overlay.
But with that approach you only get display output after driver enabled in boot process.
So I am assuming u-boot can setup UEFI framebuffer or some output type for displays..
You would need to add to the board defconfig for the display or enable it in u-boot somehow..

I never tried any DSI yet. It seems hopeless. ZioMario has one of the early Pockets and there was a DTS on wiki for that display.

Unlike in the original MNT Reform, the JDI LT070ME050 display panel in Pocket Reform does not speak eDP (embedded display port) but MIPI-DSI, which is common in mobile devices. Most ARM SOCs—including the i.MX8MPlus—have native MIPI-DSI output, so theoretically things should "just work". There are no standard connectors or pinouts in DSI land, though
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A Technical Walkthrough

Take a Deep Dive Into the Mechanical Side of Pocket Reform
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ZioMario

Thread 'Support for MIPI DSI screens within FreeBSD'

Hello.

We are a team of developers who are working on building a FreeBSD powered smartphone. We bought the mobo QSMP from Karo. Karo support ensured that the LCD driver,which is embedded into the screen assembly, has support by Linux kernel.

The linux kernel provides a driver for a "Techstar ts8550b" display that uses the ST7701 LCD controller chip. Thus, it should not be too hard to get the display working with the QSMP or QSRZ.

Is there some good support for MIPI DSI screens within FBSD that you know ? Is it possible to port it from Linux ? Any consideration is appreciated.
 
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