Difference between revisions of "Panda How to MLO & u-boot"

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You can build these from source, or try to find binaries. One issue with the binary route is that you might want to alter the kernel command line embedded inside u-boot. Such as for experimenting with different partition formats, or different filesystem types (ext3 vs ext2), etc. Of course you could stop the autoboot and type it in yourself, but we will build from source. An even better solution is to use a boot.scr file to send parameters to u-boot, it's easy to create, see below.  
 
You can build these from source, or try to find binaries. One issue with the binary route is that you might want to alter the kernel command line embedded inside u-boot. Such as for experimenting with different partition formats, or different filesystem types (ext3 vs ext2), etc. Of course you could stop the autoboot and type it in yourself, but we will build from source. An even better solution is to use a boot.scr file to send parameters to u-boot, it's easy to create, see below.  
  
For this How-to, we will use the Code Sourcery G++ version arm-2009q3. It should already be installed on your system. Kernels have also been successfully built with arm-2010q1.
+
For this How-to, we will use the Code Sourcery G++ version arm-2009q3. It should already be installed on your system. MLO, u-boot and kernels have also been successfully built with arm-2010q1.
  
 
== MLO ==
 
== MLO ==
Line 13: Line 13:
 
  git clone git://gitorious.org/pandaboard/x-loader-mainline.git
 
  git clone git://gitorious.org/pandaboard/x-loader-mainline.git
  
cd to the x-loader directory
+
cd to the x-loader-mainline directory
  
 
Next, select the panda config:
 
Next, select the panda config:
Line 23: Line 23:
 
  make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- ift
 
  make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- ift
  
This should produce the MLO file in the x-loader directory.
+
This should produce the MLO file in the x-loader-mainline directory.
 
+
  
 
== u-boot ==
 
== u-boot ==
Line 31: Line 30:
 
  git clone git://gitorious.org/pandaboard/u-boot-mainline.git
 
  git clone git://gitorious.org/pandaboard/u-boot-mainline.git
  
 +
cd to the u-boot-mainline directory
  
 
Next, select the panda config:
 
Next, select the panda config:
Line 36: Line 36:
 
  make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- omap4_panda_config
 
  make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- omap4_panda_config
  
Change ttyS2 to ttyO2 in the u-boot kernel command line in: u-boot/include/configs/omap4_panda.h
+
Change ttyS2 to ttyO2 in the u-boot kernel command line in: u-boot/include/configs/omap4_panda.h (unless you are going to use boot.scr)
  
 
Now compile U-boot:
 
Now compile U-boot:
Line 42: Line 42:
 
  make USE_PRIVATE_LIBGG=yes CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi-
 
  make USE_PRIVATE_LIBGG=yes CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi-
  
This should produce u-boot.bin in the u-boot directory
+
This should produce u-boot.bin in the u-boot-mainline directory
 +
 
  
 
=== boot.scr ===
 
=== boot.scr ===
 +
 +
Copy the following code to boot_mmc.txt
 +
setenv bootargs 'root=/dev/mmcblk0p2 rw rootwait rootfstype=ext3 console=ttyO2,115200n8  vram=16M'
 +
fatload mmc 0 82000000 uImage
 +
bootm 82000000
 +
 +
Then run the following command from in same directory that you created boot_mmc.txt:
 +
 +
mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n "Panda SD Boot" -d boot_mmc.txt boot.scr
 +
 +
This will produce a boot.scr file.
 +
 +
Edit the boot_mmc.txt file to suit your needs and re-run the mkimage command to generate a new boot.scr,
 +
put it into the vfat partition along with MLO and uboot.bin.
  
 
== Creating a working SD card ==
 
== Creating a working SD card ==
Line 123: Line 138:
  
 
No clue as to how to fix it (yet).
 
No clue as to how to fix it (yet).
 +
 +
More to come....
  
 
[[Category:PandaBoard]]
 
[[Category:PandaBoard]]

Revision as of 02:33, 23 July 2011

This is a WIP don't be surprised if nothing below this line is correct.

Introduction

Newer kernels require that you use a recent MLO (x-loader) and u-boot.

You can build these from source, or try to find binaries. One issue with the binary route is that you might want to alter the kernel command line embedded inside u-boot. Such as for experimenting with different partition formats, or different filesystem types (ext3 vs ext2), etc. Of course you could stop the autoboot and type it in yourself, but we will build from source. An even better solution is to use a boot.scr file to send parameters to u-boot, it's easy to create, see below.

For this How-to, we will use the Code Sourcery G++ version arm-2009q3. It should already be installed on your system. MLO, u-boot and kernels have also been successfully built with arm-2010q1.

MLO

First, let's get the x-loader source code and build it.

git clone git://gitorious.org/pandaboard/x-loader-mainline.git

cd to the x-loader-mainline directory

Next, select the panda config:

make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- omap4430panda_config

Now compile MLO:

make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- ift

This should produce the MLO file in the x-loader-mainline directory.

u-boot

Now for U-boot:

git clone git://gitorious.org/pandaboard/u-boot-mainline.git

cd to the u-boot-mainline directory

Next, select the panda config:

make CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- omap4_panda_config

Change ttyS2 to ttyO2 in the u-boot kernel command line in: u-boot/include/configs/omap4_panda.h (unless you are going to use boot.scr)

Now compile U-boot:

make USE_PRIVATE_LIBGG=yes CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi-

This should produce u-boot.bin in the u-boot-mainline directory


boot.scr

Copy the following code to boot_mmc.txt

setenv bootargs 'root=/dev/mmcblk0p2 rw rootwait rootfstype=ext3 console=ttyO2,115200n8  vram=16M'
fatload mmc 0 82000000 uImage
bootm 82000000

Then run the following command from in same directory that you created boot_mmc.txt:

mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n "Panda SD Boot" -d boot_mmc.txt boot.scr

This will produce a boot.scr file.

Edit the boot_mmc.txt file to suit your needs and re-run the mkimage command to generate a new boot.scr, put it into the vfat partition along with MLO and uboot.bin.

Creating a working SD card

Use this script to prepare an SD card with the small vfat partition and the larger ext2/3 partition (it has been posted many places, I take no credit for it btw, the card needs to be larger than 64Mbytes since this original script wants to make a 64Mbyte vfat partition) You may need to be root for some of the following operations. For the feint of heart, you can use sudo instead in the right places.

#!/bin/sh
if [ ! "$1" = "/dev/sda" ] ; then
	DRIVE=$1
	if [ -b "$DRIVE" ] ; then
		dd if=/dev/zero of=$DRIVE bs=1024 count=1024
		SIZE=`fdisk -l $DRIVE | grep Disk | awk '{print $5}'`
		echo DISK SIZE - $SIZE bytes
		CYLINDERS=`echo $SIZE/255/63/512 | bc`
		echo CYLINDERS - $CYLINDERS
		{
		echo ,9,0x0C,*
		echo ,,,-
		} | sfdisk -D -H 255 -S 63 -C $CYLINDERS $DRIVE
		mkfs.vfat -F 32 -n "boot" ${DRIVE}1
		mke2fs -j -L "rootfs" ${DRIVE}2
	fi 
fi


If you have trouble with the pandaboards ROM CODE not liking your vfat partition check it out with this program.

Thanks go to mru and av500 who have gone a long way to dispell the cargo-cult fokelore surrounding the ROM CODE.


#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main( int argc, char **argv )
{
	if ( argc < 2 ) {
		printf("check /dev/sdX you must be root too \n");
		return 1;
	}
	int fd = open( argv[1], O_RDONLY );

	lseek( fd, 0 + 446 + 8, SEEK_SET );

	int start;
	int num_mbr;
	read( fd, &start, 4 );
	read( fd, &num_mbr, 4 );

	int num_bpb = 0;
	
	lseek( fd, start * 512 + 0x13, SEEK_SET );
	read( fd, &num_bpb, 2 );

	if( num_bpb == 0 ) {
		lseek( fd, start * 512 + 0x20, SEEK_SET );
		read( fd, &num_bpb, 4 );
	}
	
	printf( "start: %d  mbr: %d  bpb: %d -> %s\n", 
		start, num_mbr, num_bpb, 
		num_mbr == num_bpb ? "PASS" : "FAIL!" );

	return num_mbr == num_bpb;


Save the above text as sdtest.c and compile it with:

gcc sdtest.c -o sdtest

I run it on the desktop that setup my sd card, if it reports failure then something went wrong with the setup script.

No clue as to how to fix it (yet).

More to come....