On Thu, Apr 28, 2016 at 08:41:38PM +0200, Marwa Hamza wrote:
---------- Forwarded message ---------- From: Tom Rini trini@konsulko.com Date: 2016-04-28 20:08 GMT+02:00 Subject: Re: [U-Boot] change the relocate address of u-boot To: Marwa Hamza marwahamza63@gmail.com Cc: u-boot@lists.denx.de
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.