ZSBL Code and FSBL Code

eden · November 29, 2022, 6:15am

What is the website for downloading the ZSBL or FSBL code or binary file？
and what is the predeﬁned address？？

image854×467 38.4 KB

tgm · November 29, 2022, 12:00pm

What is the website for downloading the ZSBL or FSBL code or binary file？

This?

and what is the predeﬁned address？

0x2000_0000?

github.com

sifive/freedom-e-sdk/blob/master/bsp/sifive-hifive-unmatched/README.md

# SiFive HiFive Unmatched

The SiFive HiFive Unmatched features an FU740-C000 SoC with the U74-MC Core IP.

## Configuring MSEL

The mode select switches should be set as follows:
```
                   BOOT MODE SEL               BATT CONN
 +==================+-+-+-+-+-+=================|======|===+
 |                  | | | | |X| ON              (      )   |
 |                  | | | | | |                 (      )   |
 |        CHIP_ID-> |X|X|X|X| | OFF             (______)   |
 |                +-+-+-+-+-+-+                            |
 |                     3 2 1 0 <--MSEL                     |
 |                                                         |
```

This will cause the board to boot from the SPI flash at 0x2000\_0000.

JimWilson · November 29, 2022, 10:11pm

It is possible to disassemble the zsbl with gdb if you are using OpenOCD to connect to the board.

The initial boot process is documented in the FU740-C000 doc on the web site, see section 6 which shows the code at the reset vector address and explains how the ZSBL works. Since the reset vector and zsbl are mask roms on the FU740 chip, there is no way to change them.
https://www.sifive.com/boards/hifive-unmatched

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ZSBL Code and FSBL Code

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