Emerson MVME2500 Manuel D’Utilisation

MVME2500 Installation and Use (6806800L01H)

104

U-Boot aborts the boot sequence and enters into a command line interface mode. 

In this mode, U-Boot downloads and boots the Linux kernel from an external TFTP server and 
mounts a root file system located on a network server.

1.

Make sure that the 

kernel, dtb,

 and 

ramdisk

 are accessible to the board from the 

TFTP server.

2.

Configure U-Boot environment variables:

setenv ipaddr <IP address of MVME2500>

setenv serverip <IP address of TFTP server>

setenv gatewayip <gateway IP>

setenv netmask <netmask>

setenv bootargs 'root=/dev/ram rw console=ttyS0,9600n8 

ramdisk_size=700000 cache-sram-size=0x10000'

saveenv

3. Transfer the files through the TFTP from the server to the local memory.

tftp 1000000 <kernel_image>

tftp 2000000 <ramdisk>

tftp C00000 <kernel dtb>

 

4. Boot the Linux from the memory.

bootm 1000000 2000000 c00000

 Enter the command setenv bootdelay -1; saveenv  to disable the U-Boot auto-boot 
feature and let the U-Boot directly enter the command line interface after the next 
reboot/power up.