Freescale MPC8315ERDB Board
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1. Board Switches and Jumpers
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S3 is used to set CONFIG_SYS_RESET_SOURCE.
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To boot the image at 0xFE000000 in NOR flash, use these DIP
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switch settings for S3 S4:
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+------+ +------+
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| | | **** |
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| **** | | |
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+------+ ON +------+ ON
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4321 4321
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(where the '*' indicates the position of the tab of the switch.)
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To boot the image at the beginning of NAND flash, use these
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DIP switch settings for S3 S4:
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+------+ +------+
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| * | | *** |
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| *** | | * |
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+------+ ON +------+ ON
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4321 4321
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(where the '*' indicates the position of the tab of the switch.)
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When booting from NAND, use u-boot-nand.bin, not u-boot.bin.
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2. Memory Map
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The memory map looks like this:
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0x0000_0000 0x07ff_ffff DDR 128M
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0x8000_0000 0x8fff_ffff PCI MEM 256M
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0x9000_0000 0x9fff_ffff PCI_MMIO 256M
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0xe000_0000 0xe00f_ffff IMMR 1M
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0xe030_0000 0xe03f_ffff PCI IO 1M
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0xe060_0000 0xe060_7fff NAND FLASH (CS1) 32K
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0xfe00_0000 0xfe7f_ffff NOR FLASH (CS0) 8M
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When booting from NAND, NAND flash is CS0 and NOR flash
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is CS1.
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3. Definitions
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3.1 Explanation of NEW definitions in:
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include/configs/MPC8315ERDB.h
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CONFIG_MPC83xx MPC83xx family
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CONFIG_MPC831x MPC831x specific
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CONFIG_MPC8315 MPC8315 specific
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CONFIG_MPC8315ERDB MPC8315ERDB board specific
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4. Compilation
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Assuming you're using BASH (or similar) as your shell:
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export CROSS_COMPILE=your-cross-compiler-prefix-
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make distclean
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make MPC8315ERDB_config (or MPC8315ERDB_NAND_config for u-boot-nand.bin)
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make all
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5. Downloading and Flashing Images
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5.1 Reflash U-Boot Image using U-Boot
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NOR flash:
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tftp 40000 u-boot.bin
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protect off all
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erase fe000000 fe1fffff
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cp.b 40000 fe000000 xxxx
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protect on all
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You have to supply the correct byte count with 'xxxx'
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from the TFTP result log.
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NAND flash:
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=>tftpboot $loadaddr <filename>
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=>nand erase 0 0x80000
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=>nand write $loadaddr 0 0x80000
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...where 0x80000 is the filesize rounded up to
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the next 0x20000 increment.
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5.2 Downloading and Booting Linux Kernel
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Ensure that all networking-related environment variables are set
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properly (including ipaddr, serverip, gatewayip (if needed),
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netmask, ethaddr, eth1addr, rootpath (if using NFS root),
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fdtfile, and bootfile).
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Then, do one of the following, depending on whether you
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want an NFS root or a ramdisk root:
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=>run nfsboot
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or
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=>run ramboot
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6 Notes
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The console baudrate for MPC8315ERDB is 115200bps.
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