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| 19:40.55 | txrxcx | is it safe to read a variable(that is bigger than the wordsize) in main if it is written to in interrupt? why is it ok that way when it isnt the other way around? reading is several instructions right? so the isr could write in the middle... |
| 19:59.59 | clever | i believe its not safe in either case for most processors |
| 20:00.16 | clever | and you should turn interupts off before reading, and back on after reading it |
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| 22:24.22 | luffe48 | i'm trying to force a new kernel on to a ppc based nas, but it just reboots before it can printk anything |
| 22:25.34 | luffe48 | the cuImage wrapper seems to work, but after it enters the actual kernel something bad happens |
| 22:26.05 | luffe48 | and, as it's ppc, i don't have jtag |
| 22:26.48 | luffe48 | i've tried to dig around in ram to see if i can find a kernel log buffer, but there just isn't anything |
| 22:27.02 | luffe48 | how do i attack this? |
| 22:27.45 | luffe48 | by kernel i mean linux |
| 22:29.50 | landley | find the serial output port and spin writing bytes to it. |
| 22:29.55 | landley | Checking the "ready to send next byte" flag. |
| 22:30.09 | landley | presumably your bootloader's setting the speed correctly and everything. |
| 22:30.37 | landley | You can usually get it down to a couple lines of C and do a really low level printk variant. |
| 22:30.49 | landley | Blinking an LED or toggling a gpio pin are reasonable alternatives. |
| 22:31.08 | landley | Or writing to a memory location that's preserved and visible by the bootloader code, but that's more awkward. |
| 22:31.20 | landley | Then use that to find out how far it's getting and what's triggering the reboot. |
| 22:34.31 | luffe48 | some serial output would be nice. i think i'll try to get the cuImage wrapper's uart code wedged into the kernel then. |
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| 22:47.52 | luffe48 | ok, that't tangled, that's not happening |
| 22:47.56 | luffe48 | mashing bytes out it is |
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| 23:30.56 | luffe48 | ok, so i've put a little loop into arch/powerpc/kernel/head_32.S that just pushes "a"'s into the uart |
| 23:31.07 | luffe48 | right at the __start: |
| 23:31.15 | luffe48 | still reboots with no output :* |
| 23:31.17 | luffe48 | :( |
| 23:31.55 | luffe48 | i'm not having a lot of luck with this so-called weekend project |
| 23:34.17 | luffe48 | ah - might be the wrong head*.S |
| 23:43.02 | luffe48 | nope, that's the one. what the hell? |
| 23:43.53 | clever | try to disassemble the resulting kernel, and look at the raw assembly that gets ran |
| 23:44.00 | luffe48 | good idea |
| 23:44.04 | clever | you are the cpu, run the code in your head! |
| 23:47.35 | luffe48 | this doesn't make sense |
| 23:47.45 | luffe48 | my inifnite loop is the first thing after a couple of nops |
| 23:47.56 | luffe48 | and it still just reboots |
| 23:49.49 | luffe48 | i wonder if that cuImage wrapper is trying to screw with me |
| 23:50.16 | clever | disassemble that! |
| 23:51.23 | luffe48 | right! |