a question about use dtb to bootting linux kernel on MPC83xx platform
scottwood at freescale.com
Tue Apr 8 02:38:02 EST 2008
On Mon, Apr 07, 2008 at 09:35:17AM +0800, 旭 罗 wrote:
> I am Linux software engineer. These days I was debugging a MPC8313 system. In the debugging process, some source code in the kernel makes me puzzled. So I have find your email address in the source code. I think you can give me some advises to solve the problem.
> My version is linux-18.104.22.168 and I use the device tree(dtb) to booting the kernel. In my bootloader I use the following code to jump to the kernel.
> (*image)((bd_t *)dtb_entry, (unsigned int)image, 0, 0, 0);
> The dtb_entry is the address of dtb file which in the SDRAM, the image
> is the kernel entry point. I flashed some LEDs in my board. So I can make
> sure the program run to the machine_init() which is defined in the
> /arch/powerpc/kernel/setup_32.c In order to trace the problem I search the
> source code. I can find that these information is printed by the start
> function which is defined in the /arch/powerpc/boot/main.c.
> Fourth more I have found that the kernel call the platform_init which is
> defined in the /arch/powerpc/boot/cuboot-83xx.c. looking the file head I
> have known you are the author for this file. Could you told me how the
> kernel call the platform_init function and I hope you can show me the
> booting process of the MPC83xx linux or you could give me some document
> about it.
As I said when you e-mailed me privately a few days ago, cuImage is for
older u-boots that pass in a bd_t, not a device tree. You should be booting
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