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stnolting / neorv32

:desktop_computer: A small, customizable and extensible MCU-class 32-bit RISC-V soft-core CPU and microcontroller-like SoC written in platform-independent VHDL.

Home Page:https://neorv32.org

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Configure Bootloader.c booting from address other than start of IMEM (Ex: 0x2000, etc)

SteveZ-Cal opened this issue · comments

commented

FPGA Setup

NEORV32 on Cyclone V De0-CV
IMEM: 128KB
DMEM: 64KB

Hardware

Version: V1.8.6 (Purpose: compatible to Zephyr latest version)

Bootloader Console

I just followed "5.Uploading and Starting of a Binary Executable Image via UART" using TeraTerm for windows

Set Baud Rate to 19200

Describe the bug

When booting from address other than start of IMEM, neorv32_uart0_printf won't print the desired output, even though the binary content starting from that booting address is correct

Ex: Booting from 0x2000

I just configured the bootloader.c with its inline assembly starting from 0x2000 instead of NEORV32_SYSINFO->ISPACE_BASE

Program to be uploaded -> a simple hello_world file with "neorv32_port_set(2) to indicate if the PC actually start/execute the file I uploaded given it's booting from address other than 0x0000"

When upload its corresponding bin file to the terminal program, even though the program is executing ( given that the led is on from the neorv32_port_set(2), which eliminated the execution error ), there's nothing to be print out or garbage to be print out. (I also checked that it's not a file misaligned issue)

commented

Hey @SteveZ-Cal.

So you want to make the bootloader boot from address 0x00002000, right? Did you also modify the "ROM" base address in the linker script? The compiler might (for sure) emit code that is not position-independent. Hence, the linker scripts is always required to correspond to the physical memory layout.

commented

Thanks a lot!!

That resolved all of issues I encountered :)