Digi 9P 9360/9750 - Manual (Page 7)

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Introduction......................................................................................................44
U-Boot ...................................................................................................................44
ConnectCore 9P 9360/9750 .............................................................................45
Linux boot methods ...............................................................................................46
TFTP/NFS........................................................................................................46
NAND-Flash ....................................................................................................46
NOR Flash .......................................................................................................47
USB..................................................................................................................47
Linux boot process.................................................................................................48
Passing arguments to the kernel.......................................................................50
Automating the image download .....................................................................50
Updating the Flash memory.............................................................................50
Updating a running system (the easy way) ......................................................51
Updating a running system manually ..............................................................51
Step 1: Download the new image file to RAM..........................................52
Step 2: Erase the Flash partition ................................................................52
Step 3: Write the image to Flash................................................................52
ConnectCore 9P 9360/9750 .............................................................................53
U-Boot .......................................................................................................53
Kernel.........................................................................................................53
Root File System........................................................................................53
Updating a corrupted system using a debugger .....................................................54
ConnectCore 9P 9360/9750 .............................................................................54
Chapter 8 Root File System Types ................................................... 55
NFSROOT .......................................................................................................55
Step 1: Set bootargs to be passed to the kernel..........................................56
Step 2: Download the kernel to RAM via TFTP .......................................56
Step 3: Launch the kernel from RAM .......................................................56
JFFS2 ...............................................................................................................57
Step 1: Set bootargs to be passed to the kernel..........................................58
Step 2: Copy the kernel to RAM ...............................................................58
Step 3: Launch the kernel from RAM .......................................................58
Chapter 9 Interfaces & Devices........................................................ 61
Serial interface .................................................................................................61
USB host interface ...........................................................................................62
I2C interface ....................................................................................................62
SPI interface.....................................................................................................62