wong wrote:

hi, all

I'm a newbie to both u-boot and qemu. Maybe it's a silly question, but I can not find the solution through the Internet for almost 2 weeks, sorry :(

Here is my question:

I wanna run u-boot as a standalone app (or image?) in qemu, and I do't wanna any create linux image. Is that possible? I just wanna to study u-boot.

I have no idea if it is possible with that particular emulation, but I did something similar with qemu-system-mips. Qemu loads a bootloader binary image on startup (if available) with most emulations, for you it should be named arm_bios.bin probably. You can tell Qemu from what directory to load it with the -L option, so just create a symlink to u-boot.bin named arm_bios.bin and launch qemu-system-mips -L . /dev/null (/dev/null is needed so it will not complain that you have no kernel and no disk image)

When you pass the -kernel option to qemu, it usually has a very small internal bootloader to setup a few registers and pass control to the kernel. I know it does this for mips.

And now, my idea is to create a flash image with u-boot, how about this way?

It depends on how that particular machine is emulated. Check the -pflash option Qemu, it might help.

Regards, Vlad