To boot via tftp, on OMAP_L137_EVM I set the bootcmd env variable like this:
bootcmd=tftp;bootm
here a printout of my tftp working environment:
bootdelay=3
baudrate=115200
ethaddr=00:0e:99:02:fd:82
filesize=1B8994
fileaddr=C0700000
rootpath=/home/bagside/workdir/filesys
bootfile=uImage
serverip=192.168.0.198
ipaddr=192.168.0.199
nfshost=192.168.0.198
bootcmd=tftp;bootm
bootargs=console=ttyS2,115200n8 noinitrd rw ip=dhcp root=/dev/nfs
nfsroot=192.168.0.198:/home/bagside/workdir/filesys,nolock mem=32M
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 1.3.3 (Apr 23 2009 - 17:32:00)
Da:
davinci-linux-open-source-bounces+msponchiado=ciellecnc.com@linux.davincidsp
.com
[mailto:davinci-linux-open-source-bounces+msponchiado=ciellecnc....@linux.da
vincidsp.com] Per conto di Aditya Barawkar
Inviato: giovedì 3 febbraio 2011 10.12
A: davinci-linux-open-source@linux.davincidsp.com
Oggetto: boot through tftp
hi,
We are using a DM6446 EVM.
We have compiled a kernel for the board, in which we enabled various
drivers required(through make menuconfig)
Now we want the kernel to be booted via tftp(unlike what is default booting
from flash) and the filesys will be nfs as usual.
the bootargs for the tftp are as follows...(as given in the texas getting
started guide)
EVM # setenv bootcmd 'dhcp;bootm'
EVM # setenv serverip <tftp server ip address>
EVM # setenv bootfile <name of kernel image>
EVM # setenv rootpath <root directory to mount>
EVM # setenv nfshost <ip address of nfs host>
EVM # setenv bootargs video=davincifb:vid0=720x576x16,
2500K:vid1=720x576x16,2500K:osd0=720x576x16,2025K
davinci_enc_mngr.ch0_output=COMPOSITE
davinci_enc_mngr.ch0_mode=$(videostd)
console=ttyS0,115200n8 noinitrd rw ip=dhcp root=/dev/nfs
nfsroot=$(nfshost):$(rootpath),nolock mem=120M
but when we boot the board we get following error:
Unknown command 'dhcp' - try 'help'
and the kernel boots from flash as default.
TirDavinci_EVM# printenv
bootdelay=3
baudrate=115200
ethaddr=ff:ff:ff:ff:ff:ff
ipaddr=192.168.0.51
nfshost=10.42.43.1
rootpath=/home/aditya/workdir/filesys
serverip=10.42.43.1
bootargs=video=davincifb:vid0=
720x576x16,2500K:vid1=720x576x16,2500K:osd0=720x576x16,2025K
davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=NTSC
console=ttyS0,11M
bootfile=/var/lib/tftpboot/uImage
bootcmd=dhcp;bootm <<<---------------For boot through tftp
(refering to section 4.7 , A.4.4 in getting started guide..sprue66d.pdf)
stdin=serial
stdout=serial
stderr=serial
Environment size: 526/8188 bytes
TirDavinci_EVM# boot
Unknown command 'dhcp' - try 'help'
<<<---------------dhcp command not recognised by uboot
## Booting image at 02050000 ...
Image Name: Linux-2.6.10_mvl401-davinci_evm
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1324188 Bytes = 1.3 MB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
OK
Starting Davinci linux kernel...
Uncompressing
Linux.......................................................................
........................... done, booting thee
and the orignal kernel is booted...
Also we are confused on
1) can we boot the kernel through tftp without copying the image into the
memory of target?? or we necessarily have to copy the image into the memory
of target and then boot??
2)we have searched on booting via tftp...and we found that lot of people use
following command::
tftp 0x80700000 uImage
will this command write the new "uImage" to 0x80700000 on the target?
what is the address 0x80700000 pointing to?
will my orignal kernel get affected if we write to this address?
thanks in advace!
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