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| 11:41.50 | JViz | is there an fpga channel? |
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| 17:02.19 | gkwhc | anyone tried emulating I2S with SSP/SSI? |
| 17:03.53 | landley | I might be about to? :) |
| 17:04.10 | landley | Fiddling with some strange USB chip that's not downshifting to 1.1 properly because the termination values need to be manually set in the driver, or some such. |
| 17:04.23 | landley | Still investigating. WAAAAAAY out of my depth here, still not a hardware guy... |
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| 17:08.32 | *** topic/#edev is Discussion of embedded systems (Hardware/Software/Linux/WinCE/Commercial Device Repurposing) : Busybox and Buildroot : http://www.elinux.org |
| 17:10.01 | gkwhc | landley: yeah, and especially timing is quite a barrier to get through |
| 17:12.38 | gkwhc | i wonder if there are any audio chips similar to Portal Player's (acquired by NVIDIA) |
| 17:51.54 | prpplague | where the heck is cosmic when you need him |
| 18:15.37 | landley | Last I heard on the subject was "Cosmic, man, he's gotta get his little froggy self away from this harper dude." But that was some time ago... |
| 18:15.43 | landley | Something about a rainbow-colored studebaker. |
| 18:20.28 | landley | Sigh. At work: dealing with yet another hand-rolled toolchain and build system. This toolchain has an insanely long path, so I drop a symlink to it. Try to compile a -static hello world through the symlink... can't find the headers. |
| 18:20.37 | landley | MY TOOLCHAIN GOT THIS RIGHT YEARS AGO. |
| 18:20.58 | landley | I don't mind reinventing the wheel. I do mind all the square wheels. |
| 18:30.47 | landley | They hardwired ARCH= and CROSS_COMPILE= in as the first two lines of the kernel makefile. *whimper* |
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| 18:31.25 | landley | Hiya CosmicPenguin. prpplague and some muppets were looking for you. |
| 18:31.40 | prpplague | hehe |
| 18:32.11 | prpplague | CosmicPenguin: i know you have done some fat filesystem stuff in the past, you got any handy tools on analyzing fat partitions? |
| 18:32.30 | landley | prpplague: you can analyze a fat partition with a hex editor. |
| 18:32.46 | landley | They're about as straightfoward as filesystems get and still be usable. |
| 18:33.02 | landley | You have mtools, right? |
| 18:33.02 | prpplague | landley: yea, doing that now, i was just curious if there was a more robust tool |
| 18:33.11 | landley | Define "analyze". |
| 18:33.48 | landley | (Somehow, I _knew_ probusculating was goign to work into this. FYI.) |
| 18:34.02 | landley | (And yes, when I was 7, I looked that word up.) |
| 18:34.56 | CosmicPenguin | What landley said - that stuff is really straight forward |
| 18:35.54 | landley | Um, the last really _deep_ dive into FAT I did was around 1992, but it's named for the "file allocation table" which is just an array of sector identifiers used to form linked lists. |
| 18:36.10 | landley | Directories are just files containing arrays of a directory structure. |
| 18:37.25 | landley | I vaguely recall a block allocation bitmap too. |
| 18:38.15 | landley | I forget where the root directory starts, might be the first sector after the file allocation table. |
| 18:38.47 | landley | I could _write_ you a tool to do stuff with this in about an hour, I expect. Depending on what you wanted to do, anyway. |
| 18:39.02 | landley | prpplague: still waiting for a definition of "analyze" in this context. Whatcha wanna do? |
| 18:39.12 | SpeedEvil | The FAT is the allocation bitmap |
| 18:39.26 | prpplague | landley: basically i just want to compare the formating between to partitions |
| 18:39.38 | prpplague | landley: yea i found the issue |
| 18:39.46 | SpeedEvil | Well - it has cluster numbers, and magic cluster numbers to say 'empty' |
| 18:39.53 | SpeedEvil | also 'bad' |
| 18:39.57 | landley | SpeedEvil: so they zero out entries to indicate they're free and then you search for the next zeroed one to find free sectors? |
| 18:40.05 | SpeedEvil | Something like that, yes |
| 18:40.10 | prpplague | landley: was just curious if there was an easy tool for comparing two filesystems |
| 18:40.18 | landley | I'm trying to remember somethign I knew the intimate details of 19 years ago. :) |
| 18:40.29 | landley | prpplague: diff? |
| 18:40.38 | landley | The formatting... you mean file layout? |
| 18:40.57 | landley | Compare it to see what? |
| 18:41.08 | landley | How fragmented they are? |
| 18:41.28 | prpplague | landley: yea, the layout |
| 18:42.23 | prpplague | looks like i need to add a couple hidden sectors |
| 18:42.36 | landley | Well, assuming that fat32 just turned the table from a u16 fat[size]; into a u32fat[size] (or did it do 24 bit?)... |
| 18:43.22 | landley | Hiding sectors is easy, just fill in their own number in the FAT so they point to themselves, they'll be considered used so won't get overridden, but nothing will point to them. |
| 18:43.41 | landley | The downside is fsck will go "aaaaah! EVIL FROM THE 8th DIMENSION!" and wipe 'em out. |
| 18:44.19 | landley | But yeah, recursive infinite files are one of the fun things you can do with fat. Although any filesystem that pays attention to the dentry info to get the length will cut them off there. |
| 18:44.32 | landley | Which pretty much they all do since FAT only has sector granularity... |
| 18:44.51 | landley | (Cross-linked files should be obvious.) |
| 18:45.38 | landley | I remember a FUN one with DOS 4 was that if you extended a file without filling in the data, it wouldn't update the FAT table entries until you wrote data to those sectors. TRIVIAL way to create cross-linked files there... |
| 18:45.40 | prpplague | landley: its just an arg in mkfs.vfat |
| 18:45.41 | landley | DOS was crap. |
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| 19:35.03 | *** topic/#edev is Discussion of embedded systems (Hardware/Software/Linux/WinCE/Commercial Device Repurposing) : Busybox and Buildroot : http://www.elinux.org |
| 20:03.51 | prpplague | landley / CosmicPenguin yea looks like it is missing fsinfo sector that is giving me gried |
| 20:03.53 | prpplague | grief |
| 20:05.04 | landley | ok |
| 20:07.34 | prpplague | question is, is there a linux tool to generate fsinfo entry |
| 20:28.12 | landley | I just correctly typed a wget command to grab a historical kernel version, with the full URL worked out entirely from memory, and it worked on the first try. |
| 20:28.18 | landley | I've been doing this too long, I need to go to lunch now. |
| 20:28.32 | landley | I am DISTURBED TO KNOW SOME OF THIS STUFF. |
| 20:32.09 | alex4nder | it's because you're a god among men. |
| 20:37.26 | landley | alex4nder: bacchus? I don't even drink. |
| 20:43.51 | alex4nder | and funny, too |
| 20:53.51 | prpplague | wonders where MIrrell has been |
| 21:00.22 | landley | He got a new job, I don't think he can access irc from work. |
| 21:01.12 | landley | Also last I heard his grandmother was dying, which was a bit distracting. |
| 21:12.09 | prpplague | landley: ahh |
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