> For the complete documentation index, see [llms.txt](https://tk233.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tk233.gitbook.io/notes/risc-v-soc/other-chipyard-stuff/booting-bearlyml-with-external-spi-flash.md).
# Booting BearlyML With External SPI Flash
Connect SPI to FE310.
We need to use J-Link to communicate with the board/chip. So run `JLink.exe`
## J-Link Commands
[Here](https://wiki.segger.com/J-Link_Commander) and [here](https://docs.rs-online.com/5cbd/0900766b8165024a.pdf) are some references. Can also type `?` in terminal to see list of command.
To connect device
```
connect FE310
```
List Regs
```
Regs
RReg pc
```
Examine memory content
```
Mem32 0x20000000, 2
```
Erase Flash
```
Erase 0x20000000, 0x20001000
```
Load file to Flash
```
LoadFile C:\Users\TK\Desktop\HAL\firmware\build\firmware.bin, 0x20000000
```
Common commands as GDB
```
Halt
Go
Reset
Step
```
## SPI Wiring