SOM204 is SODIMM form factor System-On-Module we are working for a while (actually from so long time ago that SOM204-EVB platform is made in Eagle which we dropped to use officially from quite some time ago).
The SODIMM connector has these signals:
- Power supply: +5V, GND, LiPobattery, RTC_backup, Stepup-Output, Stepup-enable, USB+5V
- Interfaces: Gigabit Ethernet, Megabit Ethernet, CAN, SATA, PCIe, USB2.0 HOST x2, USB-OTG, USB3.0 HOST, HSIC, UARTx3, SPIx2, I2Cx2, CSI, microSD, GPIOs with interrupts,
- Display: HDMI, VGA
- Audio: SPDIF, Line-in/out, Microphone, Headphone.
You can see complete SOM204 platform signals here.
The idea behind SOM204 is to make Universal interchangeable SOM with different performance and resources.
Our first SOM204 module is with A20 processor, it’s now in production and will be available for purchase next week.
The second SOM204 module is with A64, the third is with RK3328 which we expect to be ready for production around June. Next to follow is AM335X which will be ready by end of the year together with RK3399. The goal is to have 5 different modules by the end of the year.
A20-SOM204 comes with 1GB RAM, optional SPI Flash or eMMC Flash up to 64GB, two native Ethernets (this is the only A20 board with dual native Ethernets) Gigabit and Megabit, SATA and so on. The USB3.0 interface and PICe interfaces are not wired. On top on SOM204 platform LCD and additional GPIOs are exposed on FPC connectors:
The A20-SOM204 schematic is here.
A20-SOM204-EVB is evaluatuon board with A20-SOM204
A20-SOM204 software is Armbian with mainline kernel and support for all SOM peripherials.
olimex 
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