new repo: https://github.com/newluhux/qemu-hui
I’m try add mt7628 support into qemu.
| hardware | status | test result |
|---|---|---|
| DDR 256MiB | OK | uboot ok, linux ok, NetBSD 9.0 ok |
| SYSCTL | OK | uboot ok, linux ok, NetBSD 9.0 ok |
| INTC | OK | linux ok, NetBSD 9.0 ok |
| TIMER | TODO | |
| MEMC | TODO | |
| UART | OK | uboot ok, linux ok, NetBSD 9.0 ok |
| HSUART | TODO | |
| I2C | TODO | |
| AUDIO | TODO | |
| GDMA | TODO | |
| SPI MASTER | OK | uboot ok, linux ok |
| EHCI | OK | uboot ok, linux ok, NetBSD 9.0 ok |
| OHCI | OK | uboot ok, linux ok, NetBSD 9.0 ok |
| FLASH-DIRECT | OK | uboot ok |
| ETHERNET | OK | uboot ok, linux ok, NetBSD 9.0 ok |
| SDXC | TODO | |
| GPIO | TODO | |
| PCIE | TODO |
You can boot from flash, but need skip ‘ddr_calibrate’:
Disassemble uboot.bin, find the location of the ddr_calibrate function, and then use hexedit to modify it so that it can skip ddr initialization (because qemu does not emulate it).
If you not skip ddr_calibrate, you will take a lot of time at memory test,
but uboot still can bootup, test on mainline uboot.
I can’t found it on real board.
I am going to write a simple bootrom to initialize the device, only use for qemu.
- use buildroot build firmware: https://github.com/newluhux/vocore2/tree/master/buildroot
why use vocore2’s buildroot?:
I found ‘mt7628_evb’ in uboot source code, but I can’t found this board on taobao or ebay.
- get qemu source tree and apply patch
git clone https://gitlab.com/qemu-project/qemu /path/to/qemu
cd /path/to/qemu/
git am < xxxx.patch- build qemu
cd /path/to/qemu/
./configure --cc=gcc --cxx=g++ \
--target-list=mipsel-softmmu \
--enable-debug --enable-debug-tcg --enable-debug-info
make -j$(nproc)
make check- run qemu:
because use ‘uboot.elf’.
you must select ‘CONFIG_REMAKE_ELF=y’ in uboot config file.
cd /path/to/qemu/
./qemu-system-mipsel -M mt7628 -m 128 \
-nographic \
-serial telnet:127.0.0.1:4000,server \
-serial telnet:127.0.0.1:4001,server \
-serial telnet:127.0.0.1:4002,server \
-drive if=mtd,index=0,file=/path/to/buildroot/output/images/flash_16M.bin,format=raw \
-object filter-dump,id=f1,netdev=hub0port0,file=dump.dat \
-kernel /path/to/buildroot/output/build/u-boot-VERSION/uboot.elf \
-s -Sconnect to serial port:
telnet 127.0.0.1 4000 # UART0
telnet 127.0.0.1 4001 # UART1
telnet 127.0.0.1 4002 # UART2look network traffic:
use wireshark open ‘dump.dat’
same with qemu
2022/01/06: UART output is working, input is not working, need impl irq.
2022/01/09: add unimp memory region mapping.
2022/01/14: add mt7628-intc, UART input is working. can use shell.
2022/01/15: upload missing code, fix intc, add mt7628 reset control, usb host is working.
2022/01/16: add flash direct access support. try add boot from flash support, but uboot is not working, need fix qemu to run unmodify uboot.
2022/01/18: try send patch to qemu upstream.
2022/01/21: uboot is wip, I need emulate a mt7628 DDR controler.
2022/01/23: write a ddr controler is boring, try impl spi master.
2022/01/25: spi master is ok, default attach a w25q128 flash, next is ethernet or pcie.
2022/01/28: spi master have bug, rewrite it, add chip select.
2022/01/30: uboot is working, you can use uboot to boot from flash.
2022/02/04: rewrite system control, merge vocore2 device to mt7628 device.
2022/02/13: write a ethernet emulate, uboot bootp can working.
2022/02/14: fix ethernet recive missing some packet, add ohci.
2022/02/15: spi control support two cs line.
2022/02/16: flash direct access is provide by spi controller.
2022/02/19: now, you can boot from flash, but need skip ddr_calibrate, please read source code, support bootrom.
2022/03/17: rewrite ethernet emulation, add interrupt support, network is pass on NetBSD 9.0
2023/03/30: my job is busy, haven’t time to test it, now mt7628’s ethernet can work on mainline openwrt.
2023/03/31: study i2c :), try impl i2c controller.