Rewriting flash

Last updated: September 30, 2007

Under construction

The on-board flash contains 3 images:

	0xffc00000 - 0xffefffff :	File system (3MB) for 4MB flash or
	0xff800000 - 0xffefffff :	File system (7MB) for 8MB flash
	0xfff00000 - 0xfff3ffff :	U-BOOT & environment variables (256 KB)
	0xfff40000 - 0xffffffff :	Compressed kernel image (768 KB)

The current U-BOOT (version 1.2.0) size is below the size of 1 flash sector (128KB). Check ALL settings in your cc1000.h configuration file if U-BOOT grows beyond 128KB.

Writing a new U-BOOT image to flash

After building a new U-BOOT image, copy this image to your tftpboot directory.
If your flash already contains an U-BOOT image use the following commands to rewrite the U-BOOT image:

	tftpboot 0x100000 /tftpboot/cc1000/u-boot.bin
	protect off 0xfff00000 0xfff3ffff
	erase 0xfff00000 0xfff3ffff
	cp.b 0x100000 0xfff00000 {length-reported-by-tftpboot}
	protect on 0xfff00000 0xfff3ffff

Round-up the length reported by the tftpboot command (in bytes).

If your flash contains the original firmware, the BDM-interface has to be used to write the U-BOOT image to flash.

Writing a new kernel image to flash

After building your new kernel copy the new uImage to your tftpboot directory. Use the following U-BOOT commands to write it to flash:

	tftpboot 0x100000 /tftpboot/cc1000/uImage
	protect off 0xfff40000 0xffffffff
	erase 0xfff40000 0xffffffff
	cp.b 0x100000 0xfff40000 {length-reported-by-tftpboot}
	protect on 0xfff40000 0xffffffff

Round-up the length reported by the tftpboot command (in bytes).

Writing a new filesystem to flash

After building your new uRamdisk copy the new filesystem image to your tftpboot directory. Use the following U-BOOT commands to write it to flash:

	For a CC1000 with 4MB flash:

	tftpboot 0x100000 /tftpboot/cc1000/uRamdisk
	protect off 0xffc00000 +0x200000
	erase 0xffc00000 +0x200000
	cp.b 0x100000 0xffc00000 {length-reported-by-tftpboot}
	protect on 0xffc00000 +0x200000

	For a CC1000 with 8MB flash:

	tftpboot 0x100000 /tftpboot/cc1000/uRamdisk
	protect off 0xff800000 +0x200000
	erase 0xff800000 +0x200000
	cp.b 0x100000 0xff800000 {length-reported-by-tftpboot}
	protect on 0xff800000 +0x200000

(The above examples are for a uRamdisk of 1.6 MB)
Round-up the length reported by the tftpboot command (in bytes).