| |
1. NOR Flash (2Mbyte) |
| |
|
• Being located at 0x0, it is used to store boot code |
| |
|
• Memory map |
| |
|
| 0x001F0000 - 0x0001FFFF |
used by u-boot to save environment variables |
| 0x00040000 - 0x001EFFFF |
blank |
| 0x00010000 - 0x0003FFFF |
u-boot code (upto 184k) |
| 0x00000000 - 0x0000FFFF |
CyberLab bootloader |
|
| |
|
• 1.6M bytes of space (0x40000 ~ 0x1EFFFF) is available for compressed Linux kernel |
| |
|
|
| |
2. NAND Flash (32Mbyte) |
| |
|
• I/O mapped device controlled by registers at 0x4e000000 ~ 0x4e000014 |
| |
|
• can be configured as boot device by R9 and R10 on the board |
| |
|
• All 32Mbyte space is available for Linux file system |
| |
|
• See http://www.linux-mtd.infradead.org/archive/tech/nand.html for details about NAND vs. NOR flash |
| |
|
|
| |
3. Store File System to NAND Flash |
| |
|
• Create CRAMFS image from LN2410disk.gz
|
| |
|
$ unzip LN2410disk.gz |
|
| |
|
$ mount -o loop LN2410disk tmp_mnt |
|
| |
|
$ mkcramfs tmp_mnt LN2410disk_cramfs |
|
| |
|
| |
|
• Download LN2410disk_cramfs to onboard DRAM |
| |
|
LN2410SBC # tftp 0x31000000 LN2410disk_cramfs |
|
| |
|
TFTP from server 172.16.1.35; our IP address is 172.16.1.37 |
|
| |
|
Filename 'LN2410disk_cramfs'. |
|
| |
|
Load address: 0x31000000 |
|
| |
|
Loading: |
|
| |
|
########################################################### |
|
| |
|
done |
|
| |
|
Bytes transferred = 1691648 (19d000 hex) |
|
| |
|
|
| |
|
• Program NAND flash |
| |
|
Default MTD partition in drivers/mtd/nand/smdk2410.c |
| |
|
| 0x01000000 - 0x01FFFFFF |
/dev/mtdblock4, 16Mbyte, default boot |
| 0x00800000 - 0x00FFFFFF |
/dev/mtdblock3, 8Mbyte |
| 0x00400000 - 0x007FFFFF |
/dev/mtdblock2, 4Mbyte |
| 0x00200000 - 0x003FFFFF |
/dev/mtdblock1, 2Mbyte |
| 0x00000000 - 0x001FFFFF |
/dev/mtdblock0, 2Mbyte |
|
| |
|
• Erase /dev/mtdblock4 |
| |
|
LN2410SBC # nand erase 0x1000000 0x1000000 |
|
| |
|
• Copy cramfs image in DRAM to NAND flash |
| |
|
LN2410SBC # nand write 0x31000000 0x1000000 0x19d000 /* source, destination, size */ |
|
| |
|
|
| |
4. Store Kernel to NOR Flash |
| |
|
• Create kernel image using mkimage tools in u-boot/tools |
| |
|
$ mkimage -A arm -O linux -T kernel -C none -a 0x30f00000 -e 0x30f00000 -n "Linux 2.4.18" -d |
|
| |
|
zImage zImage.bin |
|
| |
|
This command creates zImage.bin from zImage by appending small piece of code that copies |
| |
|
zImage from NOR flash to 0x30f00000 in RAM and jumps into 0x30f00000. |
| |
|
|
| |
|
• Download zImage.bin onboard DRAM |
| |
|
LN2410SBC # tftp 0x31000000 zImage.bin |
|
| |
|
TFTP from server 172.16.1.35; our IP address is 172.16.1.37 |
|
| |
|
Filename 'zImage.bin'. |
|
| |
|
Load address: 0x31000000 |
|
| |
|
Loading: |
|
| |
|
########################################################### |
|
| |
|
done |
|
| |
|
Bytes transferred = 673192 (a45a8 hex) |
|
| |
|
| |
|
• Erase NOR flash |
| |
|
LN2410SBC # flinfo /* get flash information */ |
|
| |
|
|
|
| |
|
Bank # 1: AMD: 1x Amd29LV160DB (16Mbit) |
|
| |
|
Size: 2 MB in 35 Sectors |
|
| |
|
Sector Start Addresses: |
|
| |
|
00000000 (RO) 00004000 (RO) 00006000 (RO) 00008000 (RO) 00010000 (RO) |
|
| |
|
00020000 00030000 00040000 00050000 00060000 |
|
| |
|
... |
|
| |
|
001B0000 001C0000 001D0000 001E0000 001F0000 (RO) |
|
| |
|
|
|
| |
|
LN2410SBC # erase 1:7-33 /* from 0x40000 to 0x1effff */ |
|
| |
|
Erase Flash Sectors 7-33 in Bank # 1 Erasing sector 7 ... ok. |
|
| |
|
Erasing sector 8 ... ok. |
|
| |
|
.... |
|
| |
|
Erasing sector 33 ... ok. |
|
| |
|
|
| |
|
• Copy zImage from DRAM to Flash |
| |
|
LN2410SBC # cp.b 0x31000000 0x40000 0xa45a8 /* source, destination, size */ |
|
| |
|
Copy to Flash... done |
|
| |
|
It takes 2 ~ 3 minutes to finish |
| |
|
|
| |
|
• Boot kernel |
| |
|
LN2410SBC # bootm 0x40000 |
|
| |
|
|
