Didj U Boot Flashing Kernel - Revision history

Jsujjava: Remove Category Hardware Hacking

2011-05-10T17:53:22Z

Remove Category Hardware Hacking

Jsujjava: Add Category Didj, Hardware Hacking

2011-05-10T01:05:20Z

Add Category Didj, Hardware Hacking

GrizzlyAdams: /* Step 4: Write kernel */ fix leftover bits from Didj_U_Boot_Flashing_Primer

2010-04-27T02:31:21Z

‎Step 4: Write kernel: fix leftover bits from Didj_U_Boot_Flashing_Primer

GrizzlyAdams: Started page showing how to flash the kernel and rfs0 of a bricked Didj using u-boot.

2010-04-27T02:30:10Z

Started page showing how to flash the kernel and rfs0 of a bricked Didj using u-boot.

New page

This assumes you have followed [[Didj_U_Boot_Flashing_Primer]] to get lightning-boot 1.4 flashed, and have u-boot (plus the necessary rescue files) on a sdcard.

==== Step 1: Boot to u-boot ====

TODO: Put a link to the boot page here

Do not load the kernel image in u-boot, we will not need it here.

==== Step 2: Load kernel.bin into RAM ====

Initialize the MMC subsystem...

LF1000 # mmcinit

and load kernel.bin into memory.

LF1000 # fatload mmc 0 1400000 kernel.bin

Note the number of bytes read, you'll need to convert this to hexidecimal for use later.

==== Step 3: Erase the kernel pages ====

Use <code>nand erase</code> to erase the kernel pages

LF1000 # nand erase 200000 200000

You may use <code>nand dump 200000 </code> to verify that the kernel pages are now all <code>0xFF</code>.

==== Step 4: Write kernel ====

Use <code>nand write</code> to write your new kernel to flash.

LF1000 # nand write 1400000 200000 [value you wrote down in step 2]

You should use <code>nand dump 0</code> to verify that lightning-boot was written.

==== Step 5: Repeat the above steps for RFS0 ====

Use erootfs.jffs2 as the source file, 0x400000 as the target address, and 0xe00000 as the erase size.
Just like with the kernel, you will want to note the size of the binary, and only write the necessary bytes.

==== Step 6: Cross fingers, reboot ====

At this point you should be ready to boot using your new kernel and RFS. Type <code>reset</code> in u-boot, select normal boot and see what happens.
You should be able to use leapfrog connect to restore the remaining data.

← Older revision		Revision as of 17:53, 10 May 2011
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	You should be able to use leapfrog connect to restore the remaining data.		You should be able to use leapfrog connect to restore the remaining data.
	[[Category:Didj]]		[[Category:Didj]]
−	~~[[Category:Hardware Hacking]]~~

← Older revision		Revision as of 01:05, 10 May 2011
Line 44:		Line 44:
	At this point you should be ready to boot using your new kernel and RFS. Type <code>reset</code> in u-boot, select normal boot and see what happens.		At this point you should be ready to boot using your new kernel and RFS. Type <code>reset</code> in u-boot, select normal boot and see what happens.
	You should be able to use leapfrog connect to restore the remaining data.		You should be able to use leapfrog connect to restore the remaining data.
		+	[[Category:Didj]]
		+	[[Category:Hardware Hacking]]

@@ Line 33: / Line 33: @@
   LF1000 # nand write 1400000 200000 [value you wrote down in step 2]
-You should use <code>nand dump 0</code> to verify that lightning-boot was written.
+You should use <code>nand dump 200000</code> to verify that kernel was written.
 ==== Step 5: Repeat the above steps for RFS0 ====