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<valhalla> I've flashed the latest uboot (2012-07-11) on the nanonote and now it isn't booting from SD anymore (I press M+power it cycles inside uboot until I release M, and then starts from the nand)
<xiangfu> valhalla, sorry about the bug, the code is same, after we update the gcc/uclibc, it woldn't boot from sd anymore
<kristianpaul> :o
<xiangfu> valhalla, I will try to fix that bug next few days. (I am slow)
<xiangfu> kristianpaul, Hi
<xiangfu> kristianpaul, I have one fpga question.
<kristianpaul> oh sure
<kristianpaul> Hi !
<valhalla> xiangfu: ok, so it is a known problem, thanks
<xiangfu> kristianpaul, here is a simple verlog code.
<xiangfu> kristianpaul, if I don't connect any oscillator, the 'y'(which I connect a led) will flash. where is the clock from?
<kristianpaul> i think i missed your pastebin..
<kristianpaul> you dont need an oscillator all times, it varies from what you want to synthesize
<xiangfu> kristianpaul, here: http://pastebin.com/kLTn9JS2
<kristianpaul> and the .ucf?
<xiangfu> kristianpaul, http://pastebin.com/bA6sxiKj
<xiangfu> kristianpaul, there is nothing connect to P55.
<kristianpaul> okay but is unconeected?
<kristianpaul> not even grounded?
<xiangfu> no ground. nothing.
<kristianpaul> wich would made me think thats where you clock came from :)
<kristianpaul> ah
<xiangfu> that is my question. I use jtag load the bitstream to chip.
<kristianpaul> i *think* your "clock" just came from the static,
<kristianpaul> if you have a scope around you could try to see the LED input from fpga
<kristianpaul> i bet is not that stable clock at all
<kristianpaul> jtag have its own clock, not to be related with any other clock source used on your verilog project
<kristianpaul> xiangfu: u there?
<xiangfu> yes
<kristianpaul> why you not try to ground that P50
<xiangfu> you mean P55?
<kristianpaul> ah yes sorry
<xiangfu> kristianpaul, here is my board: http://en.qi-hardware.com/wiki/Mini-slx9
<kristianpaul> from the verilog it self or externally
<xiangfu> kristianpaul, all pins are not ground . I only connect the pins I am using.
<kristianpaul> well, in your UCF file you claim that will use that P55
<kristianpaul> you dint.. but you either ground it..
<kristianpaul> so this could lead to unknow behavior i think
<kristianpaul> ah nice board !
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<kristianpaul> xiangfu: what i said answer your question?
<xiangfu> (lead to unknow behavior i think). ok.
<kristianpaul> i'm not 100% certain
<kristianpaul> but just what i learn from milkymist, ie this https://github.com/milkymist/milkymist/blob/master/boards/milkymist-one/rtl/system.v#L1103
<xiangfu> ok. I have 40M,20M,8M,6M,2M oscillator
<kristianpaul> made me think if not using it you should ground it "assign mc_clk = 1'b0;"
<xiangfu> I try to connect 40M/20M to P55.
<kristianpaul> in your case externally
<kristianpaul> what happen when you connect it?
<xiangfu> but the mc_clk is output. not like my P55(input)
<kristianpaul> ahh true
<xiangfu> kristianpaul, nothing happen. I keep get 0 from 'x'
<xiangfu> I also not sure if my little oscillator board is working.
<xiangfu> I just connect 3.3v and GND to the osc. and connect one wire to P55.
<kristianpaul> you have scope?
<xiangfu> from the datasheet. it says the userclk must be short then 0.8cm (Stubs, if necessary, must be shorter than 8 mm (0.3 inches).)
<kristianpaul> hmm
<xiangfu> kristianpaul, I have a usb scope. dso2090. but after update my system the 'openhantek' command not working any more.
<wpwrak> your little board probably violates a 1000 design recommendations already. what's one more ? ;-))
<xiangfu> wpwrak, :-)
<kristianpaul> xD
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<wpwrak> just try to run things at slow clocks and slow I/O (QUIETIO sounds good), then you should be able to get away with most things.
<xiangfu> wpwrak, yes. I have 40M/20M osc on my desk. the 8M/6M/2M osc is one the way to my desk. :)
<xiangfu> hope the 2M is slow enough.
<xiangfu> the hdl code is interesting. is not running line by line. once power on. all lines code are running. :)
<kristianpaul> yup
<kristianpaul> as it is sinthesized
<xiangfu> wpwrak, I read the QUIETIO is better for LED.
<xiangfu> in fact I am not question understand. when should i use QUIETIO/SLOW/FAST
<xiangfu> kristianpaul, wpwrak : after I remove 'clk/P55' the led still flashing. the code is like: http://pastebin.com/rYb33fVS
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<kristianpaul> how you connected a and b?
<xiangfu> to 3.3v
<kristianpaul> btw your counter missed a reset.. guess not matter much here but just to get used to use it :)
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<kristianpaul> but is flashing under the espected freq?
<kristianpaul> if you ground 1 or b, it should stop
<kristianpaul> s/1/a
<qi-bot> kristianpaul meant: "if you ground a or b, it should stop"
<xiangfu> it's flashing at expected freq.
<xiangfu> if I ground b or a to GND, it will stop.
<xiangfu> all works like there is a clock somewhere.
<kristianpaul> the counter :-)
<kristianpaul> thats your clock source
<xiangfu> what you mean?
<kristianpaul> your hdl code describe something that looks like a counter
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<kristianpaul> you have the build log at hand?
<xiangfu> kristianpaul, I can rebuild it now. wait
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<xiangfu> kristianpaul, here is the full log: http://pastebin.com/6aGMku8k
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<kristianpaul> ah look line 111
<kristianpaul> that is a loop aka your clock source :-)
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<xiangfu> still don't understand :(
<kristianpaul> you could make a clock using combinational logic
<kristianpaul> thats a circuit input is fed by it own output
<kristianpaul> so is a loop
<xiangfu> ok
<xiangfu> kristianpaul, thanks. I got it.
<kristianpaul> sure? ..
<kristianpaul> i still thinkking.. well i dont know how xst sinthesized it..
<xiangfu> I got some idea. not very clear. my goal is connect the external osc. this is not very important for now. :)
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<kristianpaul> ah ok
<kristianpaul> you could even made an osc of the fpga, using a couple not gates in a loop :)
<xiangfu> kristianpaul, is there some code? :)
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<kristianpaul> second
<kristianpaul> oops, better minute i'm looking
<kristianpaul> damn, so far i just found this ilustration http://goo.gl/oibwQ
<xiangfu> sure I just take a look. and learn
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<Fallenou> xiangfu: hey :) experimenting some fpga design ? :)
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<LunaVorax> hi
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<Jay7> 3d tracking interface
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