Messages in this thread | ![/](/images/icornerl.gif) | | From | Andrew Kirilenko <> | Subject | Re: Stored data missed in setup.S | Date | Wed, 23 Apr 2003 17:50:50 +0300 |
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Hello! > > [SNIPPED...] > > > OK. And now code looks like: > > --> > > start_of_setup: # line 160 > > # bla bla bla - some checking code > > movb $1, %al > > movb %al, (0x100) > > .... > > .... > > cmpb $1, (0x100) > > je bail820 # and it DON'T jump here > > <-- > > > > > > I'm sure, I'm doing something wrong. But what??? > > The only possibiity is that the code you just showed is not > being executed. Absolute location 0x100 is not being overwritten > by some timer-tick (normally) so whatever you write there should > remain. You just put a byte of 1 in that location and then > you compared against a byte of 1. If the CPU was broken, you > wouldn't have even loaded your code. > > It is quite likely that the IP is being diverted around your code > by some previous code. > > FYI, you can check the progress of your code by 'printing' on > the screen. Set up ES to point to the screen segment, and write > letters there: > > movw $0xb800, %ax > movb %ax, %es > movb $'A', %es:(0) > > This 'prints' an 'A' at the first location on the screen.
Ha! I don't have video adapter not keyboard on that PC :) And, when I change je to jmp it works perfectly.
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