Digi 9P 9360/9750 manual Linux boot methods, NAND-Flash

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L i n u x b o o t m e t h o d s

Linux boot methods

Linux is booted by U-Boot in one of the following ways:

TFTP/NFS

Flash memory

USB storage device (e.g. an USB memory stick)

The following information describes each boot method.

TFTP/NFS

With this method, the Linux kernel is downloaded through Ethernet via TFTP protocol from the server's TFTP folder.

Use the "tftp" command from the U-Boot command line to copy a kernel image from your TFTP server to the target's RAM. Then use "bootm" to execute it.

#setenv bootargs console=...

ip=$(ipaddr):$(serverip)::$(netmask):2440:eth0:off root=nfs

nfsroot=$(serverip):$(npath)

#tftp <load_addr> <kernel_image>

#bootm <load_addr>

A faster way to do this is to use the "boot_net" macro, which loads a kernel image from your TFTP server to the target's RAM and then connect to a root file system via NFS.

NAND-Flash

This method will load the Linux kernel and the root file system from NAND Flash. Use the "nand read.jffs2" command to load the kernel from the NAND flash. After copying the kernel image from NAND to flash you can run it with "bootm".

#setenv bootargs console=...

ip=$(ipaddr):$(serverip)::$(netmask):2440:eth0:off root=/dev/mtdblock2 rootfstype=jffs2

#nand read.jffs2s <load_addr> <start flash> <kernel_image_size>

#bootm <load_addr>

4 6	L x N E T E S U s e r ’ s G u i d e

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Contents LxNETES User’s Guide ConnectCore 9P 9360/9750 Page Page Page Contents Building the First Project Interfaces & Devices Appendix B Overview IntroductionCross-development environment Template project Linux kernel sourcesExample applications General features FeaturesWhat’s new in LxNETES 3.2? RTC Gpio Conventions used in this manual This is a tip. It contains useful information about a topicAcronyms and abbreviations System Requirements/Prerequisites RequirementsSystem requirements Disk space Optional but recommended componentsApplications & Services Tftp daemonNFS server JTAG-Booster N E T E S U s e r ’ s G u i d e Getting Started Connecting host PC with development boardIntroduction Minicom SeyonConnect power Seyon SettingsTest Ethernet configuration Installing LxNETES # ifconfig eth0Guided Installation Manual Installation N u a l Installation Run configure Building the Default ProjectBuilding the First Project Run make install Run makeWriting applications Application DevelopmentAdding your own applications Included example applications Using C++Display Proc/cpuinfo contents Debugging applications Choose the right architecture for your target Telnet daemon utelnetd Included pre-built applicationsShell applications busybox Web server BoaNano-X/microwindows Embedded QtUseful applications MemWriting kernel modules What is a kernel module?Kernel Development Writing your own kernel modulesBuilding and loading of kernel modules Add the module to the build environmentIncluded Kernel modules Minimal Modifying the default project Advanced TopicsD i f y i n g t h e d e Fault p r o j e c t Building a custom project Boot Boot processIntroduction ConnectCore 9P 9360/9750 Bank # 0 00000000 32 MBLinux boot methods NAND-FlashNOR Flash USBLinux boot process MMUV a n c e d T o p i c s Automating the image download Passing arguments to the kernelUpdating the Flash memory Updating a running system the easy way Updating a running system manuallyErase the Flash partition Download the new image file to RAMWrite the image to Flash Kernel BootRoot File System Updating a corrupted system using a debugger Root File System Types Download the kernel to RAM via Tftp Set bootargs to be passed to the kernelLaunch the kernel from RAM JFFS2 Copy the kernel to RAM O t F i l e S y s t e m T y p e s N E T E S U s e r ’ s G u i d e Interfaces & Devices Serial interfaceSPI interface USB host interfaceI2C interface LCD interfaceSD card interface How to set the initial system date and timeCompact flash interface Real time clock RTCPCI interface Appendix a CD contentsRelated documentation RelNotes.txt Install.shReadme.txt Docs ImagesConnectCore 9P 9750 CC9P9750 SetupConnectCore 9P 9360 CC9P9360 HardwareConnectCore 9P 9360 / ConnectCore 9P Memory layoutsFlash memory layout Sdram memory layoutTextbase N E T E S U s e r ’ s G u i d e Boot command reference Appendix BO o t c o m m a n d r e f e r e n c e Skipped CC9C CCXP270 UNC90 User keys Example A9M24x0