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Lee Lup Yuen 2023-10-31 09:23:53 +08:00
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README.md
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@ -30,10 +30,12 @@ Technically Ox64 BL808 boots 64-bit RISC-V Linux (via MicroSD), so it feels like
- [OpenBouffalo Wiki](https://openbouffalo.org/index.php/Main_Page)
- [Linux Image + OpenSBI + U-Boot for BL808](https://github.com/openbouffalo/buildroot_bouffalo)
- [Linux Image + OpenSBI + U-Boot Bootloader for BL808](https://github.com/openbouffalo/buildroot_bouffalo)
[(Newer version?)](https://github.com/bouffalolab/buildroot_bouffalo)
[(OpenSBI is the BIOS for RISC-V SBCs)](https://lupyuen.github.io/articles/sbi)
- USB-C Port for Camera Module (Dual-Lane MIPI CSI)
(USB-C is not for Flashing!)
@ -95,7 +97,7 @@ Yeah don't confuse the 2 UART Ports on Ox64! Let's give the UART Ports distincti
+ Remember to connect GND
+ Baud Rate for Normal Mode: 2,000,000 (2 Mbps)
+ Baud Rate for Flashing Mode: 230,400 (230.4 kbps)
+ Controlled by the M0 Wireless Core (OpenBouffalo Firmware)
+ UART0 controlled by the M0 Wireless Core (OpenBouffalo Firmware)
1. __Ox64 Serial Console__: Used for Linux Serial Console (plus OpenSBI and U-Boot Bootloader)
@ -103,10 +105,12 @@ Yeah don't confuse the 2 UART Ports on Ox64! Let's give the UART Ports distincti
+ Serial Console RX is physical pin 31 / GPIO 17
+ Remember to connect GND
+ Baud Rate: 2,000,000 (2 Mbps)
+ Controlled by the D0 Multimedia Core (Linux)
+ UART3 controlled by the D0 Multimedia Core (Linux + OpenSBI + U-Boot)
NEITHER UART Port is accessible over USB-C or Micro USB. So yeah it's totally counterintuitive.
(Maybe someone can create a Stackable HAT or Breadboard, that will expose the 2 UART Ports as USB Dongles?)
_Why 2 Baud Rates for Flashing UART?_
When we power up Ox64 in __Normal Mode__: (Boot Button NOT pressed)