[U-Boot] Fwd: change the relocate address of u-boot

[Tom Rini]

On Thu, Apr 28, 2016 at 08:41:38PM +0200, Marwa Hamza wrote:
> ---------- Forwarded message ----------
> From: Tom Rini <trini at 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 at gmail.com>
> Cc: u-boot at 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.

-- 
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20160428/d022cb91/attachment.sig>