SigmaStar SSD201/SSD202 powered 4G LTE industrial gateway made to run mainline Linux

SigmaStar SSD201 is a dual-core Cortex-A7 processor with 64MB RAM onchip that is designed for smart HD displays. We’ve previously seen it in Industio 7-inch smart display running Linux, but if you want to modify anything you’d need sign an NDA before getting the SDK.

Luckily there’s an open-source community named linux-chenxing that aims to bring mainline support to those low-cost SigmaStar processor to mainline, the same way linux-sunxi is working on Allwinner processors. Daniel Palmer noticed MYZR recently launched GW300 4G LTE industrial gateway with specifications that looked familiar.

SSD201 GW300 4G LTE Industrial GatewayGW300 specifications from manufacturer’s website:

  • Processor – Arm Cortex-A7 dual-core processor @ 1.2GHz
  • Memory – 64MB RAM
  • Storage – 128MByte Flash
  • Connectivity – Ethernet and 4G LTE with high-gain antenna
  • Serial – RS485/ RS232 via 5-pin terminal block
  • Misc – RTC
  • Power Supply – 12V to 24V DC input
  • Dimensions – 127.7 x 87.5 x 30 mm
  • Temperature Range – -20°C to +75°C

The gateway runs Linux and supports ModBus and MQTT for all sort of industrial IoT applications. But just to make sure Daniel bought a sample and took it apart…

SSD202 gateway board

It turns about this particular model is based on a SigmaStar SSD202D dual-core Cortex-A7 processor that is supposed to come with 128MB RAM, and also includes a LongSung M5710 4G LTE Cat 1 modem (See AT commands set PDF), ISL1208 RTC chip, SIPEX 3232EE RS232 transceiver, and SP3485 RS485 transceiver.

What even more interesting that he managed to port mainline U-boot and mainline Linux to the gateway:

That’s U-boot 2021-01 RC4 with Linux 5.11 RC4 boot from the SPI NAND flash. You can check out the full boot log if you are interested.  Many things are already working in Linux 5.11, and Daniel submitted a patch to add support the M5710 modem in Linux 5.12. Eventually, OpenWrt may be ported to the gateway if there’s enough interest from the community. You’ll find additional information on Github.

There may seen be more progress made on open-source software around SigmaStar processors, as I’ve been told the company released the SDK publicly on their website where registration is required together with a China Mobile number, and Widora is current developing a SSD202D module and posted (parts of) the SDK on Github.

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