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| Raspberry Pi 1 Bare Bones & QEMU https://forum.osdev.org/viewtopic.php?f=8&t=36328 |
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| Author: | jbltx [ Sat Nov 30, 2019 5:20 pm ] |
| Post subject: | Raspberry Pi 1 Bare Bones & QEMU |
Hello, I just read the tutorial about Raspberry Pi Bare Bones : https://wiki.osdev.org/Raspberry_Pi_Bare_Bones#Pi_Model_A.2C_B.2C_A.2B.2C_B.2B.2C_and_Zero I was wondering if the code is up-to-date for BCM2835 (arm11) ? Because I can't get it working on QEMU. My steps : - Create kernel.c, boot.S and linker.ld - Change in kernel.c -> GPIO_BASE = 0x20200000 - Change in kernel.c -> UART0_BASE = (GPIO_BASE + 0x1000) - Check linker.ld's LOADER_ADDR is equal to 0x8000 - Check boot.S' stack setup is using #0x8000 Build : Code: arm-none-eabi-gcc -mcpu=arm1176jzf-s -fpic -ffreestanding -std=gnu99 -c kernel.c -o kernel.o -O2 -Wall -Wextra arm-none-eabi-gcc -mcpu=arm1176jzf-s -fpic -ffreestanding -c boot.S -o boot.o arm-none-eabi-gcc -T linker.ld -o myos.elf -ffreestanding -O2 -nostdlib boot.o kernel.o -lgcc Test : Code: qemu-system-arm -m 256 -M versatilepb -cpu arm1176 -serial stdio -kernel myos.elf There's no output in stdio, it just hangs. The version of GCC is 9.2.1 (20191025). I was able to make it work for raspberry Pi 2 and 3, but not for the first one. That's unfortunate because I have a Pi Zero which uses the same architecture as the first Pi... Thank you. |
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| Author: | Velko [ Mon Dec 02, 2019 6:27 am ] |
| Post subject: | Re: Raspberry Pi 1 Bare Bones & QEMU |
Have you tried to run it on a real RPi ? It looks like you're launching Qemu specifying VersatilePB board, which (most likely) has different I/O addresses. |
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