HiFive1 Rev B bootrom source code

HiFive1 Rev B
1

I looked at SiFive website but could not find it: is the HiFive1 Rev B bootrom source code available? I’m really curious to see how initialization is done.

Also, when I run example programs I see this on the console after reboot:

ATE0-->ATE0
OK
AT+BLEINIT=0-->OK
AT+CWMODE=0-->OK

is this expected?

2

Hi Agasfer,

We’re sorry but the boot code is not public. The console messages you are seeing are expected and they are coming from the ESP32 wifi module. If you check Figure 3 of the HiFive Getting Started Guide you’ll see that the ESP32 has a serial interface that also comes out over USB.

Regards,
Ralph

3

Thank you for replying Ralph.

It’s frustrating, with all that open hardware/software spirit I did not expect this to be the case.

I have not looked too deep into the HW specs of the chip - is there some closed source IP?

4

The output you see is printed by bootloader (not bootrom) as a result of communication with the WiFi module. The bootloader is located at the beginning of the flash. If you’re really curious, you can use Ghidra to decompile it.

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