Configure U-Boot on the Plug Computer

From PlugWiki

Access the U-Boot Boot Loader Console

Accessing the U-Boot boot loader may be done using PuTTY. Following the last steps, five and six, in the Installing and Using PuTTY instructions will grant access to the boot loader console.

The Important U-Boot Parameters for How the Plug Computer Boots

Booting the Plug from the NFS server requires certain parameter and environment variable settings. The existing settings may be viewed using the command printenv at the command prompt in PuTTY. [Command keystrokes are italicized.]

The following settings are necessary for booting the Plug from the NFS server:

 baudrate=115200
 loads_echo=0
 netmask=255.255.255.0
 CASset=min
 MALLOC_len=1
 ethprime=egiga0
 bootargs_root=root=/dev/nfs rw
 bootargs_end=:::DB88FXX81:eth0:none
 bootcmd=tftpboot 0x2000000 $(image_name);setenv bootargs $(console) $(bootargs_root) 
 nfsroot=$(serverip):$(rootpath) ip=$(ipaddr):$(serverip)$(bootargs_end) $(mvNetConfig) 
 $(mvPhoneConfig);  bootm 0x2000000; standalone=fsload 0x2000000 $(image_name);setenv bootargs
 $(console) root=/dev/mtdblock0 rw  ip=$(ipaddr):$(serverip)$(bootargs_end) $(mvPhoneConfig); bootm 0x2000000;
 ethmtu=1500
 mvPhoneConfig=mv_phone_config=dev0:fxs,dev1:fxs
 mvNetConfig=mv_net_config=(00:11:88:0f:62:81,0:1:2:3),mtu=1500
 usb0Mode=host
 yuk_ethaddr=00:00:00:EE:51:81
 nandEcc=1bit
 netretry=no
 rcvrip=169.254.100.100
 loadaddr=0x02000000
 autoload=no
 console=console=ttyS0,115200 mtdparts=cfi_flash:0xf40000(root),0xc0000(uboot)ro
 ethaddr=00:50:43:3c:3b:6e
 image_name='''''uImage.4mini'''''
 rootpath='''''/usr/src/marvell/marvell_builds/sheevaplug/gentoo_sheevamini_256M'''''
 ethact=egiga0
 bootargs=console=ttyS0,115200 mtdparts=cfi_flash:0xf40000(root),0xc0000(uboot)ro root=/dev/nfs rw 
 nfsroot=10.0.172.165:/usr/src/marvell/marvell_builds/sheevaplug/gentoo_sheevamini_256M
 ip=10.0.172.22:10.0.172.165:::DB88FXX81:eth0:none mv_net_config=(00:11:88:0f:62:81,0:1:2:3),mtu=1500 
 mv_phone_config=dev0:fxs,dev1:fxs
 ipaddr='''''192.168.0.22'''''
 serverip='''''192.168.0.102'''''
 stdin=serial
 stdout=serial
 stderr=serial
 mainlineLinux=no
 enaMonExt=no
 enaCpuStream=no
 enaWrAllo=no
 pexMode=RC
 disL2Cache=no
 setL2CacheWT=yes
 disL2Prefetch=yes
 enaICPref=yes
 enaDCPref=yes
 sata_dma_mode=yes
 netbsd_en=no
 vxworks_en=no
 bootdelay=3
 disaMvPnp=no
 enaAutoRecovery=yes

The environment variables in bold italics depend on local settings: ipaddr, serverip, image_name, and rootpath.

An environment variable may be changed using the setenv command. To use the command, type setenv <name of variable> '<new variable value>' as in the following example:

Marvell>>setenv serverip '179.0.120.105' 
Marvell>>saveenv

After the environment variable has been set it must be saved with the saveenv command.