Ok, thanks for explaining this! Uploading the firmware through the serial itself uses xmodem/ymodem/zmodem protocol?
regards, Martin On Thu, Aug 15, 2013 at 2:29 PM, Luiz Angelo Daros de Luca < luizl...@gmail.com> wrote: > Some devices do not have an external way to activate tftp boot (like > tp-link). You must interact with bootloader in order to > ask it to download a new firmware. Other routers, that might be your case, > have some kind of "konami code" to start a > firmware recovery mode, like pressing reset while you turn on your device. > > Also, some bootloaders allows you to upload a new firmware though the > serial itself (i.e. via kermit). This allows a reflash > even for devices that do not have a working ethernet interface. Generally, > this is not recomended as it is much slower than > tftp. As I my pc has only one ethernet, I used kermit in order to keep my > internet online while flashing my device. > > Regards, > > > > --- > Luiz Angelo Daros de Luca, Me. > luizl...@gmail.com > > > 2013/8/12 Martin T <m4rtn...@gmail.com> > >> Hi, >> >> there are few guides in OpenWRT wiki which explain how to configure IP >> settings and download(using TFTP) an OpenWRT firmware file in >> bootloader(for example CFE) CLI. For example, I have following commands >> available in my CFE: >> >> CFE> help >> Available commands: >> >> rndis Broadcom USB RNDIS utility. >> et Broadcom Ethernet utility. >> nvram NVRAM utility. >> reboot Reboot. >> printdefault Display the environment default variables embeded in >> the bootloader >> flash Update a flash memory device >> autoboot Automatic system bootstrap. >> batch Load a batch file into memory and execute it >> go Verify and boot OS image. >> boot Load an executable file into memory and execute it >> load Load an executable file into memory without executing >> it >> write Write a region of memory to a remote file via TFTP >> read Read a region of memory to a remote file via TFTP >> save Save a region of memory to a remote file via TFTP >> ping Ping a remote IP host. >> arp Display or modify the ARP Table >> ifconfig Configure the Ethernet interface >> unsetenv Delete an environment variable. >> printenv Display the environment variables >> setenv Set an environment variable. >> help Obtain help for CFE commands >> >> For more information about a command, enter 'help command-name' >> *** command status = 0 >> CFE> >> >> >> As far as I know, in order to access the bootloader CLI, a working >> bootloader and serial connection is required. This means that one can not >> repair bootloader itself over serial port. And in case the OpenWRT >> installation is broken and one can not even access the failsafe mode, then >> OpenWRT can be easily flashed by uploading the OpenWRT firmware from TFTP >> client in PC without initiating this on bootloader CLI. >> >> In which situation it's useful to be able to start the TFTP client on >> bootloader CLI? Are there situations where router bootloader will not start >> the TFTP server and one is not able to upload the firmware from TFTP client >> running in PC? Or are there some other clever maintenance tasks usually >> carried out from bootloader CLI? >> >> >> >> regards, >> Martin >> >> >> _______________________________________________ >> openwrt-users mailing list >> openwrt-users@lists.openwrt.org >> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users >> >> > > _______________________________________________ > openwrt-users mailing list > openwrt-users@lists.openwrt.org > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users > >
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