On Wed, Nov 25, 2020 at 7:11 PM Siarhei Siamashka <siarhei.siamas...@gmail.com> wrote: > On Wed, Nov 25, 2020 at 5:36 PM Andy Shevchenko > <andy.shevche...@gmail.com> wrote:
... > Does this tablet / phone have an MMC slot? In fact it does. > For example, on all > Allwinner tablets it is technically possible to use MMC pins for UART > via a different non-standard pin mux setup and a breakout board: > > https://linux-sunxi.org/MicroSD_Breakout > https://linux-sunxi.org/File:MSI_Primo81_and_MicroSD_breakout.jpg > > Also are you sure that there are really no UART pads on the PCB to > solder some wires if you disassemble your tablet / phone? There are UARTs which are soldered with real devices connected. MMC can be switched to GPIO, so it would be rather bitbanging with some non-standard speed. Does U-Boot have a bitbang UART driver? -- With Best Regards, Andy Shevchenko
