Specifications

The MT7688 integrates the Wi-Fi radio, so the CPU and the wireless rows above describe the same chip.

The memory row is written the way the board actually works, not the way the marketing states it. Onion’s product page, its documentation, and the Crowd Supply campaign all list “512 MB (128 MB RAM and 384 MB flash swap file),” and CNX Software’s 2018 review says the same in plainer words: the firmware complements 128 MB of DRAM with a 384 MB swap file held on the eMMC. So the 512 MB is real as a usable figure and misleading as a RAM figure. The physical DRAM is 128 MB. CNX Software calls that DRAM DDR2, but Onion’s own pages never state a memory type, so the DDR2 detail rests on a single source and is left off the table.

Onion describes the Omega2 Pro as “based on the Omega2S+ module.” That phrase appears only on Onion’s own product page (and is reprinted on distributor listings that copy it), so it is vendor-stated rather than independently confirmed.

Onion’s documentation lists the Pro’s low-speed I/O as 18 GPIOs, 2 PWM channels, 2 UARTs, 1 I2C bus, 1 SPI bus, and 1 I2S interface. All of that comes from a single vendor document and its mirror, so treat the counts as Onion-stated. One of them Onion contradicts itself on: the Pro spec table says 2 PWM channels, but Onion’s own “Generating PWM Signals” application note says the Omega2S exposes four PWM channels while the plain Omega2 exposes two — and the Pro is described as based on the Omega2S+, which would imply four. Two Onion documents, two different numbers. It is left unresolved here until the board itself can be checked.

Sources: the MediaTek MT7688 datasheet for the CPU core and clock; Onion’s Omega2 Pro product and documentation pages and the Crowd Supply campaign page for memory, storage, Wi-Fi, power, and dimensions; CNX Software’s 2018 review as an independent second source on the memory arrangement, USB host port, and 580 MHz clock; and Onion’s own PWM application note for the conflicting channel count.