On Tue, 2008-04-08 at 13:58 +0200, Wolfgang Denk wrote:
In message 1207651833.5826.21.camel@gentoo-jocke.transmode.se you wrote:
CFG_MONITOR_BASE=fffa0000
...
I first did a new symbol for this but changed it to use _start as I didn't want to introduce yet another symbol. I would hope it is possible to rework 4xx to move the _start symbol to were it belongs? Not having the _start symbol where it should be could bite you some other day too.
I think you got this wrong. _start *is* where it should be, where the execution of the code begins. Where you set the breakpoint in gdb.
Ah, right. I *assumed* that _start was always the first symbol in the text segment too. On 4xx it isn't for some reason, but it should be possible to move it first.
Sidnote: Does execution really begin at _start for 4xx? I still looks like it begin at _start_440 and eventually end up at _start
The "new symbol" you mention corresponds to CFG_MONITOR_BASE, but note that it has no fixed address as it depends where you place your image in flash.
Yes, but the address is not important here, it is the difference _end - _start. I guess we could define a linker symbol too that calculates _end - _start for us and then just do len = _uboot_reloc_size + EXC_OFF_SYS_RESET;
or define a new symbol that is initialised to CFG_MONITOR_BASE or let the linker place it at the beginning of .text, hopefully there is already a name reserved for the symbol although I don't know of such a name. I either case I think one needs to add that symbol to the GOT list in start.S
Jocke