[U-Boot-Users] Cascaded U-Boot setup question
wellington at lucent.com
Tue Apr 13 18:22:11 CEST 2004
Now I tried:
> tftp 0x200000 u-boot.bin ; go 0x200100
U-boot begins execution but hangs after the DRAM message.
Mike Wellington wrote:
> I have multiple Xilinx ML300 boards. Each one has its own
> ip address. Each board may have different boot parameters - baud
> rate, root file system, etc. Basically each board needs its
> own boot parameters stored in some kind of non-volatile storage.
> But there is no working non-volatile storage on these boards (yet),
> until I get I2C EEPROM working. Each board just boots from its
> copy of u-boot (which is generic) from the microdrive. Now, I
> could sit at each board and as it comes up, stop the autoboot
> and manually enter the parameters, but that's clunky. What
> I want to do is build a board-specific u-boot with parameters
> that are specific to that machine-name. So my boot
> process would be:
> 1) Load the generic u-boot off the microdrive. It knows what
> *machine-name* is and where to get the next stage at.
> 2) Use the generic u-boot to download a machine-specific u-boot,
> uboot-<machine-name>, which I can recompile and change at will
> since it resides on my tftp server. I don't have to rewrite
> the microdrive every time I want to change the boot parameters,
> all I have to do is build a new *second-stage* machine-specific
> u-boot-<machine-name> and put it in the /tftp download directory.
> 3) Run the 2nd u-boot (u-boot-<machine-name>)
> (which has the machine specific parameters)
> and let it boot the kernel with the arguments that I want.
> I tried downloading an uncompressed u-boot and loading it at 0x20000,
> then just saying "go 0x20000" and it doesn't work, it generates and
> illegal instruction exception. (is the starting address of u-boot not
> at the beginning of the .TEXT section - I'll go check after I send this
> I tried downloading a compressed u-boot with '-T standalone' and then
> saying "bootm 0x200000" and that doesn't work either.
> Is this doable? It should be. Does anybody know how to do it?
> I guess the other thing I "could" do is run expect on the serial port
> and set up the paramters that way, but I think the *cascaded u-boot*
> idea is better.
> -mike wellington
> wellington at lucent.com
> platforms at bithead.com
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