lupyuen/nuttx-ox64
1
0
Fork 0
mirror of https://github.com/lupyuen/nuttx-ox64.git synced 2025-01-13 05:08:29 +08:00
Code Issues Projects Releases Packages Wiki Activity Actions

Update doc

Browse source
This commit is contained in:
Lee Lup Yuen 2023-10-31 09:14:04 +08:00
parent 48d4d0e11b
commit bb551f8549
1 changed files with 7 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
README.md
View file

@ -95,7 +95,7 @@ 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
+ Controlled by the M0 Wireless Core (OpenBouffalo Firmware)
1. __Ox64 Serial Console__: Used for Linux Serial Console (plus OpenSBI and U-Boot Bootloader)
@ -105,11 +105,13 @@ Yeah don't confuse the 2 UART Ports on Ox64! Let's give the UART Ports distincti
+ Baud Rate: 2,000,000 (2 Mbps)
+ Controlled by the D0 Multimedia Core (Linux)
NEITHER UART Port is accessible over USB-C or Micro USB. So yeah it's totally counterintuitive.
_Why 2 Baud Rates for Flashing UART?_
When we power up Ox64 in __Normal Mode__: (Boot Button NOT pressed)
- Flashing UART outputs the Firmware running on M0 Wireless Core
- Flashing UART Port will show us the OpenBouffalo Firmware running on M0 Wireless Core
- This M0 Firmware will forward Peripheral Interrupts to D0 Multimedia Core
@ -119,7 +121,7 @@ When we power up Ox64 in __Normal Mode__: (Boot Button NOT pressed)
When we power up Ox64 in __Flashing Mode__: (Boot Button pressed)
- Ox64 is ready for Firmware Flashing by BL DevCube
- Ox64 is ready for Firmware Flashing by the BL DevCube GUI Tool
- Firmware Flashing supports various Baud Rates: 230.4 kbps, 2 Mbps, ...
@ -131,6 +133,8 @@ _Serial Console is always 2 Mbps?_
Yeah 2 Mbps is hardcoded in Ox64 Linux. Switching to other Baud Rates will show garbled text.
Thus our USB Serial Adapter must connect reliably to Ox64 at 2 Mbps.
Now we flash Ox64 and boot Linux...
# Flash OpenSBI and U-Boot Bootloader to Ox64 BL808