[U-Boot-Users] running custom apps under uboot
hi
I would like to code standalone app under uboot that would test my eth chip. I tried running hello_world.srec from ram location and I got 'prefetch abort' on go. My procedure follows: tftp a0100000 hello_world.srec go a0140004 test test2 (go a0100000 test test2)
address value for go is memory location plus offset defined in Makefile. Both go commands yield an error and reset the board.
I would like to know what file and how to modify it to get standalone programs running from memory.
regards, himba
In message 403A50BA.10807@email.si you wrote:
I would like to code standalone app under uboot that would test my eth chip. I tried running hello_world.srec from ram location and I got 'prefetch abort' on go. My procedure follows: tftp a0100000 hello_world.srec go a0140004 test test2 (go a0100000 test test2)
How comes you are using 0xa0100000 as load address? Did you modify the Makefile so that this address gets used? The default value used in U-Boot for ARM systems is 0xc100000 ...
address value for go is memory location plus offset defined in Makefile. Both go commands yield an error and reset the board.
Try running the code under a debugger...
Best regards,
Wolfgang Denk
Wolfgang Denk wrote:
In message 403A50BA.10807@email.si you wrote:
I would like to code standalone app under uboot that would test my eth chip. I tried running hello_world.srec from ram location and I got 'prefetch abort' on go. My procedure follows: tftp a0100000 hello_world.srec go a0140004 test test2 (go a0100000 test test2)
How comes you are using 0xa0100000 as load address? Did you modify the Makefile so that this address gets used? The default value used in U-Boot for ARM systems is 0xc100000 ...
I'm trying to download hello_world.srec to the memory and run it from the memory, as i do with the kernel. I didn't change any Makefiles nor any of the sources. Was it wrong to think that I could execute an image from the memory that way ?
address value for go is memory location plus offset defined in Makefile. Both go commands yield an error and reset the board.
Try running the code under a debugger...
Yet to learn :). Going slow though.
Best regards,
Wolfgang Denk
rgds, himba
In message 403A69EE.6000101@email.si you wrote:
tftp a0100000 hello_world.srec go a0140004 test test2 (go a0100000 test test2)
How comes you are using 0xa0100000 as load address? Did you modify the Makefile so that this address gets used? The default value used in U-Boot for ARM systems is 0xc100000 ...
I'm trying to download hello_world.srec to the memory and run it from the memory, as i do with the kernel. I didn't change any Makefiles nor any of the sources. Was it wrong to think that I could execute an image from the memory that way ?
Standalone applications are not position-independent. They are linked for a specific address and must be loaded to and started at the correct address.
Best regards,
Wolfgang Denk
The keyboard of himbA goavr@email.si wrote:
Wolfgang Denk wrote:
In message 403A50BA.10807@email.si you wrote:
I would like to code standalone app under uboot that would test my eth chip. I tried running hello_world.srec from ram location and I got 'prefetch abort' on go. My procedure follows: tftp a0100000 hello_world.srec go a0140004 test test2 (go a0100000 test test2)
How comes you are using 0xa0100000 as load address? Did you modify the Makefile so that this address gets used? The default value used in U-Boot for ARM systems is 0xc100000 ...
I'm trying to download hello_world.srec to the memory and run it from the memory, as i do with the kernel. I didn't change any Makefiles nor any of the sources. Was it wrong to think that I could execute an image from the memory that way ?
Tftp will transfer the file byte by byte so the srec ASCII will end up in RAM - I doubt that you can run that. Try the hello_world.bin binary file intended for this purpose.
Cheers Detlev
participants (3)
-
Detlev Zundel -
himbA -
Wolfgang Denk