From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from web15907.mail.cnb.yahoo.com (web15907.mail.cnb.yahoo.com [202.165.103.52]) by ozlabs.org (Postfix) with SMTP id 09F73DDDFA for ; Mon, 7 Apr 2008 11:42:41 +1000 (EST) Date: Mon, 7 Apr 2008 09:35:17 +0800 (CST) From: =?gb2312?q?=D0=F1=20=C2=DE?= Subject: a question about use dtb to bootting linux kernel on MPC83xx platform To: linuxppc-dev@ozlabs.org MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1530653995-1207532117=:18740" Message-ID: <959437.18740.qm@web15907.mail.cnb.yahoo.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --0-1530653995-1207532117=:18740 Content-Type: text/plain; charset=gb2312 Content-Transfer-Encoding: 8bit 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-2.6.23.9 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. --------------------------------- ÑÅ»¢ÓÊÏ䣬ÄúµÄÖÕÉúÓÊÏ䣡 --0-1530653995-1207532117=:18740 Content-Type: text/html; charset=gb2312 Content-Transfer-Encoding: 8bit
   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-2.6.23.9 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.

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