Move buildroot to bsp directory.

bsp/buildroot/board/freescale/mpc8315erdb/readme.txt

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+
+******************** WARNING ********************
+The compiled U-Boot binary is intended for NAND flash only!
+It won't work for NOR and will brick that bootloader!
+
+Also don't go playing around with different U-boot versions or flash targets
+unless you've got the necessary hardware and/or know-how to unbrick your kit.
+
+2014.04 is known good for NAND.
+******************** WARNING ********************
+
+You'll need to program the files created by buildroot into the flash.
+The fast way is to tftp transfer the files via one of the network interfaces.
+
+Alternatively you can transfer the files via serial console with an Ymodem
+file transfer from your terminal program by using a "loady" command
+from the u-boot prompt instead of the "tftp ..." commands stated below.
+Beware that serial console file transfers are quite slow!
+
+Remember to set the MPC8315ERDB switches to NAND boot if you want to use
+your newly built U-Boot.
+
+1. Program the new U-Boot binary to NAND flash (optional)
+    If you don't feel confident upgrading your bootloader then don't do it,
+    it's unnecessary most of the time.
+
+    => tftp $loadaddr u-boot-nand.bin
+    => nand erase 0 0x80000
+    => nand write $loadaddr 0 0x80000 $filesize
+
+2. Program the kernel to NAND flash
+
+    => tftp $loadaddr uImage
+    => nand erase 0x100000 0x1e0000
+    => nand write $loadaddr 0x100000 0x1e0000
+
+3. Program the DTB to NAND flash
+
+    => tftp $loadaddr mpc8315erdb.dtb
+    => nand erase 0x2e0000 0x20000
+    => nand write $loadaddr 0x2e0000 0x20000
+
+4. Program the root filesystem to NAND flash
+
+    => tftp $loadaddr rootfs.jffs2
+    => nand erase 0x400000 0x1c00000
+    => nand write $loadaddr 0x400000 $filesize
+
+5. Booting your new system
+
+    => setenv nandboot 'setenv bootargs root=/dev/mtdblock3 rootfstype=jffs2 console=$consoledev,$baudrate;nand read $fdtaddr 0x2e0000 0x20000;nand read $loadaddr 0x100000 0x1e0000;bootm $loadaddr - $fdtaddr'
+
+    If you want to set this boot option as default:
+
+    => setenv bootcmd 'run nandboot'
+    => saveenv
+
+    ...or for a single boot:
+
+    => run nandboot
+
+    You can login with user "root".