[U-Boot-Users] Booting U-Boot from tftp
Hi. Would someone happen to know how I could boot into U-Boot on IBM Walnut (PPC 405GP) using the ROM monitor only? Just for testing before flashing. A ROM monitor bootable linux image can be done with mktree in linux sources, but that probably doesn't work for u-boot or does it?
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In message 20041025180012.87220.qmail@web25002.mail.ukl.yahoo.com you wrote:
Would someone happen to know how I could boot into U-Boot on IBM Walnut (PPC 405GP) using the ROM monitor only? Just for testing before flashing. A ROM monitor
This has been asked many, many times before. It can be done, but this requires modifications to U-Boot, which require more knowledge than you have (no offence meant - but otherwise you wouldn't need to ask this question). And the modified image will then NOT besuitable for burning to flash. In the end you will always burn an untested image.
Get yourself a BDI2000 and follow the standard path.
Best regards,
Wolfgang Denk
First, thanks for the answer.
--- Wolfgang Denk wd@denx.de wrote:
In message
20041025180012.87220.qmail@web25002.mail.ukl.yahoo.com
you wrote:
Would someone happen to know how I could boot into U-Boot on IBM Walnut (PPC 405GP) using the ROM
monitor
only? Just for testing before flashing. A ROM
monitor
This has been asked many, many times before. It can
Sorry. I couldn't find an answer by searching the mailing list archives (tried ppcboot also).
be done, but this requires modifications to U-Boot, which require more knowledge than you have (no offence meant - but otherwise you
None taken and you're right about that, of course. However, if it's not too difficult could you tell me how?
I could also use a debugger to load u-boot. I tried doing the following after a piece of advice on the ppcboot mailing list (google for ppcboot +riscwatch): * change walnut405/config.mk code segment start to (ADDR_IN_RAM) * change config/WALNUT405.h CFG_FLASH_BASE (and CFG_MONITOR_BASE) to (ADDR_IN_RAM) After that it didn't build .bin anymore (objcopy freezes), but ELF was built and I tried loading that with a debugger, but that didn't work. Is this kind of trick possible with u-boot anymore?
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In message 20041029121201.42802.qmail@web25009.mail.ukl.yahoo.com you wrote:
None taken and you're right about that, of course. However, if it's not too difficult could you tell me how?
It does not work for the purpose you intend to iuse it, so it's jusrt a waste of time - yours and mine.
I could also use a debugger to load u-boot. I tried doing the following after a piece of advice on the ppcboot mailing list (google for ppcboot +riscwatch):
No. Get a real debugger. Get a BDI2000.
- change config/WALNUT405.h CFG_FLASH_BASE (and
CFG_MONITOR_BASE) to (ADDR_IN_RAM)
You don't want to do that. Build U-Boot as it is configured, and use this.
Best regards,
Wolfgang Denk
participants (2)
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Chan Siu Ming -
Wolfgang Denk