From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Lungu Date: Fri, 30 May 2008 15:49:18 +0300 Subject: [U-Boot-Users] can u-boot run standalone in qemu(qemu-system-arm) without kernel image(for mainstone II) In-Reply-To: <3a3941f0805290542q5108422bxbce6cd3f29ebc6ca@mail.gmail.com> References: <3a3941f0805290542q5108422bxbce6cd3f29ebc6ca@mail.gmail.com> Message-ID: <483FF7CE.2010302@windriver.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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