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diff --git a/doc/README.mx35pdk b/doc/README.mx35pdk deleted file mode 100644 index 3d69ed5..0000000 --- a/doc/README.mx35pdk +++ /dev/null @@ -1,188 +0,0 @@ -Overview --------------- - -mx35pdk (known als as mx35_3stack) is a development board by Freescale. -It consists of three pluggable board: - - CPU module, with CPU, RAM, flash - - Personality board, with most interfaces (USB, Network,..) - - Debug board with JTAG header. - -The board is usually delivered with redboot. This howto explains how to boot -a linux kernel and how to replace the original bootloader with U-Boot. - -The board is delivered with Redboot on the NAND flash. It is possible to -switch the boot device with the switches SW1-SW2 on the Personality board, -and with SW5-SW10 on the Debug board. - -Delivered Redboot script to start the kernel ---------------------------------------------------- - -In redboot the following script is stored: - -fis load kernel -exec -c "noinitrd console=ttymxc0,115200 root=/dev/mtdblock8 rw rootfstype=jffs2 ip=dhcp fec_mac=00:04:9F:00:E7:76" - -Kernel is taken from flash. The image is in zImage format. - -Booting from NET, rootfs on NFS: ------------------------------------ - -To change the script in redboot: - -load -r -b 0x100000 <path_to_zImage> -exec -c "noinitrd console=ttymxc0,115200 root=/dev/nfsroot rootfstype=nfsroot nfsroot=192.168.1.1:/opt/eldk-4.2-arm/armVFP rw ip=dhcp" - -If the ip address is not set, you can set it with : - -ip_address -l <board_ip/netmask> -h <server_ip> - -Linux partitions: ---------------------------- - -As default, the board is shipped with these partition tables for NAND -and for NOR: - -Creating 5 MTD partitions on "NAND 2GiB 3,3V 8-bit": -0x00000000-0x00100000 : "nand.bootloader" -0x00100000-0x00600000 : "nand.kernel" -0x00600000-0x06600000 : "nand.rootfs" -0x06600000-0x06e00000 : "nand.configure" -0x06e00000-0x80000000 : "nand.userfs" - -Creating 6 MTD partitions on "mxc_nor_flash.0": -0x00000000-0x00080000 : "Bootloader" -0x00080000-0x00480000 : "nor.Kernel" -0x00480000-0x02280000 : "nor.userfs" -0x02280000-0x03e80000 : "nor.rootfs" -0x01fe0000-0x01fe3000 : "FIS directory" -0x01fff000-0x04000000 : "Redboot config" - -NAND partitions can be recognized enabling in kernel CONFIG_MTD_REDBOOT_PARTS. -For this board, CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK should be set to 2. - -However, the setup in redboot is not correct and does not use the whole flash. - -Better solution is to use the kernel parameter mtdparts. -Here the resulting script to be defined in RedBoot with fconfig: - -load -r -b 0x100000 sbabic/mx35pdk/zImage.2.6.37 -exec -c "noinitrd console=ttymxc0,115200 root=/dev/nfsroot rootfstype=nfsroot nfsroot=192.168.1.1:/opt/eldk-4.2-arm/arm rw ip=dhcp mtdparts=mxc_nand:1m(boot),5m(linux),96m(root),8m(cfg),1938m(user);physmap-flash.0:512k(b),4m(k),30m(u),28m(r)" - -Flashing U-Boot --------------------------------- - -There are two options: the original bootloader in NAND can be replaced with -u-boot, or u-boot can be stored on the NOR flash without erasing -the delivered bootloader. -The boot storage can be select using the switches on the personality board -(SW1-SW2) and on the DEBUG board (SW4-SW10). - -The second option is to be preferred if you have not a JTAG debugger. -If something goes wrong flashing the bootloader, it is always possible to -recover the board booting from the other device. - -Replacing the bootloader on the NAND --------------------------------------- -To replace RedBoot with U-Boot, the easy way is to do this in linux. -Start the kernel with the suggested options. Make sure to have set the -mtdparts exactly as described, because this matches the layout on the -mx35pdk. - -You should see in your boot log the following entries for the NAND -flash: - -5 cmdlinepart partitions found on MTD device mxc_nand -Creating 5 MTD partitions on "mxc_nand": -0x000000000000-0x000000100000 : "boot" -0x000000100000-0x000000600000 : "linux" -0x000000600000-0x000006600000 : "root" -0x000006600000-0x000006e00000 : "cfg" -0x000006e00000-0x000080000000 : "user" - -You can use the utilities flash_eraseall and nandwrite to put -u-boot on the NAND. The bootloader is marked as "boot", and 1MB is -reserved. If everything is correct, this partition is accessed as -/dev/mtd4. However, check if it is correct with "cat /proc/mtd" and -get the device node from the partition name: - -$ cat /proc/mtd | grep boot - -I suggest you try the utilities on a different partition to be sure -if everything works correctly. If not, and you remove RedBoot, you have to -reinstall it using the ATK tool as suggested by Freescale, or using a -JTAG debugger. - -I report the versions of the utilities I used (they are provided with ELDK): - --bash-3.2# nandwrite --version -nandwrite $Revision: 1.32 $ - -flash_eraseall --version -flash_eraseall $Revision: 1.22 $ - -nandwrite reports a warning if the file to be saved is not sector aligned. -This should have no consequences, but I preferred to pad u-boot.bin -to get no problem at all. -$ dd if=/dev/zero of=zeros bs=1 count=74800 -$ cat u-boot.bin zeros > u-boot-padded.bin - -To erase the partition: -$ flash_eraseall /dev/mtd4 - -Writing u-boot: - -$ nandwrite /dev/mtd4 u-boot-padded.bin - -Now U-Boot is stored on the booting partition. - -To boot from NAND, you have to select the switches as follows: - -Personality board - SW2 1, 4, 5 on - 2, 3, 6, 7, 8 off - SW1 all off - -Debug Board: - SW5 0 - SW6 0 - SW7 0 - SW8 1 - SW9 1 - SW10 0 - - -Saving U-Boot in the NOR flash ---------------------------------- - -The procedure to save in the NOR flash is quite the same as to write into the NAND. - -Check the partition for boot in the NOR flash. Setting the mtdparts as reported, -the boot partition should be /dev/mtd0. - -Creating 6 MTD partitions on "mxc_nor_flash.0": -0x00000000-0x00080000 : "Bootloader" -0x00080000-0x00480000 : "nor.Kernel" -0x00480000-0x02280000 : "nor.userfs" -0x02280000-0x03e80000 : "nor.rootfs" -0x01fe0000-0x01fe3000 : "FIS directory" -0x01fff000-0x04000000 : "Redboot config" - -To erase the whole partition: -$ flash_eraseall /dev/mtd0 - -Writing u-boot: -dd if=u-boot.bin of=/dev/mtd0 - -To boot from NOR, you have to select the switches as follows: - -Personality board - SW2 all off - SW1 all off - -Debug Board: - SW5 0 - SW6 0 - SW7 0 - SW8 1 - SW9 1 - SW10 0 |