Marvell 88W878S-BKB2 is the chip used in the PS Vita OLED (PCH-1XXX) to support Wi-Fi/Bluetooth.
- Marvell 88W8787 Overview & doc: File:Marvell Avastar 88W8787 SoC.pdf
- Marvell 88W8787 Engineering specs: File:Marvell 88W8787 engineering specifications — Foxconn for Sony.pdf
- Linux drivers: https://wikidevi.wi-cat.ru/Mwifiex#Drivers
- Chromium OS source: https://chromium.googlesource.com/chromiumos/third_party/marvell/+/854d5b47fe714bbf42dfb495b9af5f3893ca5530
- Blob in wlanbt_robin_img_ax.skprx starting at offset 305 (3.60).
SD8787 supports up to 150 Mbps for IEEE 802.11n, so the speed of Vita's 88W878S-BKB2 is probably severely nerfed. Not sure yet whether it comes from the OS through some commands, or the FW itself.