Clarification on Gecko bootloader baud rate.

[hlyi]

@jnilo1 , in 3-Main-SoC-Realtek-RTL8196E/32-Kernel/files-6.18/drivers/net/rtl8196e-uart-bridge/README.md, it mentions that Gecko bootloader (Xmodem @ 38400, no flow control), for Sengled G4, the baud rate of Gecko bootloader is 115200. Is your board using 38400? Or maybe it is auto detected?

[jnilo1]

Hi @hlyi,

Good catch — that README line was simply wrong, and you reading the docs that closely is appreciated.

The Gecko bootloader we ship (2.4.2, 23-Bootloader-UART-Xmodem/) runs at 115200: it is a build-time constant (SL_SERIAL_UART_BAUD_RATE in config/btl_uart_driver_cfg.h — committed in that directory), and flash_efr32.sh has always probed bootloader:115200. There is no auto-detection — the Gecko UART/Xmodem bootloader has no autobaud; whatever the bootloader was built with is what it listens at. 115200 is the Silabs default, which is why your Sengled stock bootloader uses it too.

The 38400 in the bridge README was a conflation with the other chip's console: the RTL8196E serial console (UART0) runs at 38400 8N1, and that figure leaked into the EFR32 bootloader sentence. Fixed in the tree, and the fix lands on v3.11.0-pre.

So: nothing special to handle on the G4 — both boards' bootloaders are at 115200, and the bridge baud the flash script sets for the Xmodem phase is already correct.

[hlyi]

@jnilo1 Thanks for confirmation. Closing