Saturday, 2016-12-24

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mithrocr1901_modern: any luck?10:03
cr1901_modernmithro (just woke up): No, not much :/. Let's see if I can't figure it out befor I need to leave at 3:30 PM EST11:38
cr1901_modernIdk when I'll be back, but prob by 8-9-ish11:38
mithro_florent_: ping - if you have some time, got some stuff I wanted to ask about11:57
cr1901_modernmithro: Currently reading this book, it's actually really good
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mithrocr1901_modern: :-P12:24
cr1901_modernmithro: Just a hunch... did you check to see that the UART worked when executing from FPGA-memory-as-ROM?12:46
mithrocr1901_modern: yes12:47
mithrocr1901_modern: I got all the way to the firmware booting and working12:47
mithrocr1901_modern: you can test it by creating one with rom12:48
cr1901_modernmithro: No need for me to do that now. That's an interesting data point.12:49
mithrocr1901_modern: pretty sure the uart did work12:49
cr1901_modernThe code never returns from printf when executing from SPI flash12:49
mithroDid you try adding a loop really early on?12:53
cr1901_modernmithro: That's my next step... wanted to test that a *single* uart char write early on works12:54
cr1901_modernthen I'll put it in a loop12:54
cr1901_modern(I need a loop that won't be optimized away, so might as well use the uart)12:54
cr1901_modernmithro: Okay, writing a *single* uart char after uart_init() in the BIOS but before the printf() works. Now let me try a loop.12:59
cr1901_modernmithro: Aha! Nice catch... it crashes during the loop13:12
cr1901_modernWhich shouldn't be happening b/c there should be a cache hit :/13:13
tpbTitle: LiteX Loop Test ยท GitHub (at
cr1901_modernThis is what the UART returns. Notice that the data is incorrect after "ABCD"13:26
mithrocr1901_modern: does it just stop after those first few characters?13:28
cr1901_modernmithro: Yes13:40
cr1901_modernEvery new line is a different push of the button13:40
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mithroHi arboresign15:41
arboresignHere Toulouse France15:44
mithroI was in France a week ago15:54
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