Difference between revisions of "Didj Boot From UART"

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(Software Needed)
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zImage kernel file for Didj Linux
 
zImage kernel file for Didj Linux
 
== Programs Needed ==
 
Terminal program, Hyperterminal, or equivalent, must be able to send via Plain Text, Xmodem, and Kermit.
 
  
 
== Hardware Needed ==
 
== Hardware Needed ==
Ability to make a Serial connection to the UART pins on the Didj, and using a resister, 470 Ohm works well, ability to attach the NAND pins D5 and D6 to ground. Common methods are a [http://www.elinux.org/Didj#Cartridges breakout board], or soldering wires to the [http://www.elinux.org/Didj_Serial_Console cartridge connector] pins.
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Ability to make a Serial connection to the UART pins on the Didj, and using a resister, 470 Ohm works well, ability to attach the NAND pins D5 to ground. Common methods are a [http://www.elinux.org/Didj#Cartridges breakout board], or soldering wires to the [http://www.elinux.org/Didj_Serial_Console cartridge connector] pins.
 
 
== Getting Started ==
 
 
 
Make sure you've got your UART connected, and the ability to pull the D5 and D6 pins low. Terminal will be set to 115200 8/n/1 to begin.
 
  
== Booting Up ==
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== UART Booting ==
  
'''Latching the power button'''
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Pull D5 pin low. (note: This is for using hyperterminal in windows, your program(s) may very in procedure.)
  
Pull the D6 pin of the NAND Flash low, then boot as normal while watching the output in Terminal, after booting is complete, pull both D5 and D6 low, type command "reboot". Didj will reboot and now you won't have to hold down the power button during the UART boot process. The screen will be blank, and the Didj will look like its off, but its actually just waiting for you to start sending the bootloader.
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1. Configure your terminal to baudrate:19200 bits:8 Flow Control:none Stopbits:1 Parity:none
  
'''Starting the UART Boot'''
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2. Open the connection in the terminal program, and hold down the power button on the Didj.
  
Keeping the D5 and D6 of NAND Flash pins low (note: This is for using hyperterminal in windows, your program(s) may very in procedure.)
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3. Using the Send Text or plain method, open lightning-boot UART version (ex. lightning-boot-1.4-UART.bin), nothing will be displayed, but usb/rs232 adapter will show activity, if its got an LED to do so.
  
1. Configure hyperterminal to 19200 8/n/1
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4. Once loaded you should see a blue screen with a menu, you can let off the power button (if you are loading an older version of lightning boot, there will be no blue screen, it will stay blank and you will need to keep the power button held down through the entire process). There is two ways to continue from here.
  
2. Make sure UART is connected, and hold down any button on the Didj except the power button.
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If you have an SD card connected you can use the lightning boot 1.4+ menu to load a zImage or u-boot.bin off of it and be finished here. Otherwise if you would like to continue loading over UART or don't have lightning boot 1.4+ switch your terminal emulator to baudrate:115200 bits:8 Flow Control:none Stopbits:1 Parity:none and use Xmodem transfer method to send u-boot.bin. Press send, then press a button on the Didj to initiate the transfer.
 
 
3. Using Send Text method, switch file type to "all" and load lightning-boot.bin, nothing will be displayed, but usb/rs232 adapter will show activity, if its got an LED to do so.
 
 
 
4. Once loaded, let up on other button. Switch hyperterminal to 115200 8/n/1 and use Xmodem method to send uboot.bin. Press send, then press a button on the Didj to initiate transfer.
 
  
 
5. Once uboot has been sent there'll be a terminal prompt, enter.
 
5. Once uboot has been sent there'll be a terminal prompt, enter.
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  LF1000# loadb
 
  LF1000# loadb
  
6. Then send zImage file using Kermit method once finished there will be another terminal prompt, enter.
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6. Then send zImage file using the Kermit transfer method once finished there will be another terminal prompt, enter.
 
  LF1000# go 1800000
 
  LF1000# go 1800000
  
7. Should now see linux kernel uncompressing then booting.
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7. This will execute the kernel and you should now see the linux kernel uncompressing then booting in the terminal console.
 
 
== Custom Boot Loaders ==
 
Refer to the proper sequence provided by the custom bootloader, as some or all of these steps may be different or unnecessary.
 
 
 
  
 
[[Category:didj]]
 
[[Category:didj]]

Revision as of 18:14, 18 June 2011

This explains how to boot your Didj over a UART connection, using the standard lighting-boot.bin uboot.bin and kernel image.

Software Needed

Lightning-boot 1.4+

u-boot

Terminal program(s) - (ex: cutecom) that can send plain binary, xmodem and kermit

zImage kernel file for Didj Linux

Hardware Needed

Ability to make a Serial connection to the UART pins on the Didj, and using a resister, 470 Ohm works well, ability to attach the NAND pins D5 to ground. Common methods are a breakout board, or soldering wires to the cartridge connector pins.

UART Booting

Pull D5 pin low. (note: This is for using hyperterminal in windows, your program(s) may very in procedure.)

1. Configure your terminal to baudrate:19200 bits:8 Flow Control:none Stopbits:1 Parity:none

2. Open the connection in the terminal program, and hold down the power button on the Didj.

3. Using the Send Text or plain method, open lightning-boot UART version (ex. lightning-boot-1.4-UART.bin), nothing will be displayed, but usb/rs232 adapter will show activity, if its got an LED to do so.

4. Once loaded you should see a blue screen with a menu, you can let off the power button (if you are loading an older version of lightning boot, there will be no blue screen, it will stay blank and you will need to keep the power button held down through the entire process). There is two ways to continue from here.

If you have an SD card connected you can use the lightning boot 1.4+ menu to load a zImage or u-boot.bin off of it and be finished here. Otherwise if you would like to continue loading over UART or don't have lightning boot 1.4+ switch your terminal emulator to baudrate:115200 bits:8 Flow Control:none Stopbits:1 Parity:none and use Xmodem transfer method to send u-boot.bin. Press send, then press a button on the Didj to initiate the transfer.

5. Once uboot has been sent there'll be a terminal prompt, enter.

LF1000# setenv bootargs mem=18M init=/sbin/init console=ttyS0,115200 root=31:06 ro rootflags=noatime rootfstype=jffs2 ubi.mtd=Brio ubi.mtd=prg_Brio ubi.mtd=Cartridge ubi.mtd=EXT
LF1000# setenv loadaddr 1800000
LF1000# loadb

6. Then send zImage file using the Kermit transfer method once finished there will be another terminal prompt, enter.

LF1000# go 1800000

7. This will execute the kernel and you should now see the linux kernel uncompressing then booting in the terminal console.