STM32MP1-OLinuXino development update, we managed to build Ubuntu 18.04.LTS with Linux Kernel 5.3. Now we need your feedback on GPIOs

One of the benefits to work with European SOC vendor and distributors – just few days after we show interest in the new STM32MP1 series of SOCs DHL come with one big carton where we got STM32MP151AAC and STM32MP157AAA3 samples plus the most comprehensive ST kit with all features of the high end STM32MP157AAA3. The credits go to EBV as we got these totally free of charge. The kit came with comprehensive documentation for both board, software support etc. In regard of customer friendliness Chinese SOC vendors has long way to go.

We needed one day to build our own Linux image as we didn’t like (no offense) the Yocto ST uses, so here is Ubuntu 18.04.LTS with Kernel 5.30 boot:

Overall we have very positive vibes that STM32MP1 is good candidate for new industrial grade OLinuXino-LIME2!

The specs of the STM32MP1-OLinuXino-LIME2 we work now are:

• STM32MP151AAC or STM32MP157AAA3 they are pin to pin compatible so one board will be used for both
• 1GB DDR3L industrial grade memory -45+90C
• Gigabit Ethernet with PoE plug-in option (*)
• AXP209 PMU with LiPo charger and step-up so everything works even with no external power supply
• two USB 2.0 high speed hosts
• USB-OTG 2.0
• HDMI+CEC
• LIME2 board shape and same connector positions
• replacing with CAN the SATA connector
• micro SD-card
• SPI/NAND/eMMC Flash on socket and different options(**)

(*) we love what Raspberry Pi did with their PoE hat, board which is working as normal, and have PoE functionality if PoE hat is attached. We intend to add such PoE feature to our other Allwinner boards too, but will take time to re-design them all.

(**) this is new experimental feature instead to keep many different LIME2 board versions which only differs the amount of flash on them. The Flash will be on plug in module, something which Odroid does for years and we do wonder why we didn’t do earlier, as now keeping so many versions of LIME, LIME2 and MICRO is killing our production manager and logistics :). If these Flash modules work as expected we will re-design our LIME, LIME2 and MICRO to use them also .

STM32MP1 series has some very unique features missing in Allwinner SOCs like:

• 6× I2C up to 1 Mbit/s
• 4× UART + 4× USART up to 12.5 Mbit/s, ISO7816, LIN, IrDA, SPI slave
• 6× SPI 50 Mbit/s, 3 FD I2S audio class accuracy
• 4× SAI stereo audio: I2S, PDM, SPDIF Tx
• SPDIF Rx with 4 inputs
• 8-14-bit camera interface up to 140 Mbyte/s
• 2× ADCs with 16-bit max. resolution 3.6-4.5Msps
• 2× 12-bit D/A converters 1 MHz

We will try to arrange GPIOs with similar functions so A20-LIME2 current customers to may exchange with STM32MP1-LIME2 if they want or to have second SOC choice, but we are open to listen to your tips and suggestions how to arrange the ADC/DAC signals and extra I2C, UARTS, SPIs on the GPIO1-GPIO4 connectors optimally.

STM32MP1 series has only one operating temperature range -45+125C.

Many people may think that on 650Mhz the Cortex-A7 cores are running slow, but this is because this SOC has to work reliable from -45 to +125C. All SOCs which run on extended temperature range run on lower speed clocks compared with same parts which run on commercial 0-70C. If you want to run your STM32MP1 board at home in non demanding apps, we are pretty sure you will be able to overclock it at much higher values and it will work, but when we talk industrial devices and reliable 24/7 operation the clocks are always announced with most conservative values.