Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> wrote: > This chip is found in cheap "free driver" USB adapters from Aliexpress. > Initially they pretend to be a CD-ROM containing the driver for Windows. > "Ejecting" switches the device to wifi mode. > > Features: 2.4 GHz, b/g/n mode, 1T1R, 150 Mbps. > > This chip is more unique than other Realtek chips: > > * The registers at addresses 0x0-0xff, which all the other chips use, > can't be used here. New registers at 0x8000-0x80ff must be used > instead. And it's not a simple matter of adding 0x8000: 0x2 > (REG_SYS_FUNC) became 0x8004, 0x80 (REG_MCU_FW_DL) became 0x8090, > etc. > > * Also there are a few new registers which must be accessed indirectly > because their addresses don't fit in 16 bits. No other chips seem to > have these. > > * The vendor driver compiles to 8188gu.ko, but the code calls the chip > RTL8710B(U) pretty much everywhere, including messages visible to the > user. > > Another difference compared to the other chips supported by rtl8xxxu is > that it has a new PHY status struct, or three of them actually, from > which we extract the RSSI, among other things. This is not unique, > though, just new. The chips supported by rtw88 also use it. > > Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> > Reviewed-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx> > Tested-by: Philipp Hortmann <philipp.g.hortmann@xxxxxxxxx> # Edimax N150 Patch applied to wireless-next.git, thanks. 70664495e3d2 wifi: rtl8xxxu: Support new chip RTL8710BU aka RTL8188GU -- https://patchwork.kernel.org/project/linux-wireless/patch/4edbe29f-00b9-8eef-9789-20bed0b141e2@xxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
