On Thu, Apr 28, 2016 at 08:41:38PM +0200, Marwa Hamza wrote: > ---------- Forwarded message ---------- > From: Tom Rini <[email protected]> > Date: 2016-04-28 20:08 GMT+02:00 > Subject: Re: [U-Boot] change the relocate address of u-boot > To: Marwa Hamza <[email protected]> > Cc: [email protected] > > > On Thu, Apr 28, 2016 at 02:47:21PM +0100, Marwa Hamza wrote: > > > hey > > i 'm trying to start a whole system on qemu (kernel , > > bootloader,filesystem) and i need to change the relocate address , so i'm > > wondering if there is a patch to change this address 0x10000000 > > You need to provide a lot more details as without any changes today > U-Boot is able to run in qemu for a number of boards that qemu supports > today. In fact, I need to get around to converting some kernelci.org > rootfs tarballs into images to pass along and use... > > -- > Tom > well qemu doesn't need a bootloader to emulate a linux kernel , it needs > only zImage and rootfs file system > qemu-system-arm -M versatilepb -kernel zImage -initrd rootfs.img.gz > I played with QEMU emulation of an ARM Versatile Platform Board > <http://infocenter.arm.com/help/topic/com.arm.doc.dui0224i/index.html>, > making it run bare metal programs > <https://balau82.wordpress.com/2010/02/28/hello-world-for-bare-metal-arm-using-qemu/>, > the U-Boot > <https://balau82.wordpress.com/2010/03/10/u-boot-for-arm-on-qemu/> boot-loader > and a Linux kernel > <https://balau82.wordpress.com/2010/03/22/compiling-linux-kernel-for-qemu-arm-emulator/> > complete > with a Busybox-based file system > <https://balau82.wordpress.com/2010/03/27/busybox-for-arm-on-qemu/>. I > tried to put everything together to emulate a complete boot procedure, but > it was not so simple > as we on execution the code copies itself into another address, which by > default is 0x1000000 (16MiB). This feature comes handy in this scenario > because it frees lower memory space in order to copy the Linux kernel. The > compressed kernel image size is about 1.5MiB, so the first 1.5MiB from the > start address must be free and usable when U-Boot copies the kernel > that works perfectly when the kernel 's size is small but when i use a > kernel 's size over 4MiB that wouldn't work that 's why changing the > relocate address will free more space
So what you need to do is something like: qemu-system-arm -M vexpress-a9 -kernel vexpress_ca9x4/u-boot -nographic -m 1G to boot qemu and the Versatile A9. And then you also need to pass in some more options to qemu-system-arm to give it a disk image that contains a kernel and root filesystem image and then boot that like a normal system would. -- Tom
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