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Author Topic: Knight Filesystem Specification  (Read 13508 times)

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SirCmpwn

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Knight Filesystem Specification
« on: September 27, 2010, 10:52:34 pm »
Attached is the specification for KFS, please review this if you have time and let me know what kind of feedback you can give.  Garbage collection is not fully thought out at the moment, so I know this portion of the document is inaccurate.  In addition, one error in this version is the page byte, this should be added so that the file entry looks as follows:
Code: (File) [Select]
Type ID (11111110b for file) Byte
Directory ID Word ; The directory containing the file
Name (0 delimited)
Page byte ; The flash page the file starts on
Offset Word ; The offset from the start of that page (+4000h) the file is on
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Offline calcdude84se

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Re: Knight Filesystem Specification
« Reply #1 on: September 27, 2010, 11:06:56 pm »
Will read when I have the chance. Good luck on figuring out garbage collection!
(On an unrelated note, I'm done with the main planning and will begin coding (my OS :P) :))
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SirCmpwn

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Re: Knight Filesystem Specification
« Reply #2 on: September 27, 2010, 11:15:16 pm »
Yay ^_^
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Offline DJ Omnimaga

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Re: Knight Filesystem Specification
« Reply #3 on: September 27, 2010, 11:27:44 pm »
I'll check this when I have a minute and nice to hear Calcdude84se :D
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Offline LordConiupiter

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Re: Knight Filesystem Specification
« Reply #4 on: September 28, 2010, 05:18:45 pm »
wow nice! Those things really are the most beautifull things to make in life IMO :D Your own working data storage system. Won't this have compatibility issues with the TIOS files? And will it be possible to send data to your calc when KnightOS is installed on it using TIconnect/TiLP? When this won't be possible, which I guess being true, will you write your own data transferring program?
« Last Edit: September 28, 2010, 05:19:20 pm by LordConiupiter »
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Offline calcdude84se

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Re: Knight Filesystem Specification
« Reply #5 on: September 28, 2010, 05:30:09 pm »
To answer your question to the best of my knowledge, yes, the TI-OS file system is wholly incompatible with the KFS. However, he plans a feature that, on first setup, allows you to do a special reformatting. (I don't know if that will be done.)
Providing he implements the protocol, it will be possible to transfer data via TI-Connect or TiLP. (I presume files will be "wrapped" into TI-OS formats for linking programs/TI-OS based calcs.)
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SirCmpwn

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Re: Knight Filesystem Specification
« Reply #6 on: September 28, 2010, 06:15:54 pm »
First question, I plan on having the installer move all of your TIOS files into a directory in KFS when it is reformatted.  The VAT (TIOS Filesystem) is completely incompatible (the main reason dual boot is out of the question).  I will possibly write my own linking program, but TI Connect support is also planned.
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Offline calcdude84se

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Re: Knight Filesystem Specification
« Reply #7 on: September 28, 2010, 06:17:38 pm »
Thanks for clarifying. It also appears I forgot to explicitly state the effects/purpose of the special reformatting. :P
« Last Edit: September 28, 2010, 06:18:21 pm by calcdude84se »
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Offline Deep Toaster

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Re: Knight Filesystem Specification
« Reply #8 on: September 28, 2010, 09:17:18 pm »
Yay, does this mean you're done working on the KFS? :D

Also, a random question (I probably don't know what I'm talking about): How would you tell the difference between garbage entries and simply nonexistent ones?

And would 2ND+[OFF] actually turn the calc completely off in the OS?
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Offline calcdude84se

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Re: Knight Filesystem Specification
« Reply #9 on: September 28, 2010, 09:22:07 pm »
Sadly, there's no way to turn the calc completely off without removing all the batteries. That's just the hardware.
And that random question is confusing me. (Not that I am confused about the FS, but rather the question itself) ???
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Offline Deep Toaster

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Re: Knight Filesystem Specification
« Reply #10 on: September 28, 2010, 09:32:31 pm »
Well, it says that 0000000b is for "garbage" entries, but what if it's already deleted?

EDIT: Oh, wait, they're all in flash. Never mind.
« Last Edit: September 28, 2010, 09:32:57 pm by Deep Thought »
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Offline calcdude84se

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Re: Knight Filesystem Specification
« Reply #11 on: September 28, 2010, 09:35:33 pm »
Oh, you thought it was RAM. Okay, that makes more sense.
Glad to know you've figured it out. :)
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Offline Deep Toaster

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Re: Knight Filesystem Specification
« Reply #12 on: September 28, 2010, 09:37:42 pm »
Yeah. Well, about that, if you can't turn the calc completely off, why keep everything in flash? Is it just to protect against mem clears?
« Last Edit: September 28, 2010, 09:37:59 pm by Deep Thought »
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Offline calcdude84se

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Re: Knight Filesystem Specification
« Reply #13 on: September 28, 2010, 09:39:21 pm »
Pretty much, not to mention flash has so much more storage space. (Or in case you have to change the batteries.)
Rather important also if the system can be brought down in two bytes.
Code: [Select]
di
halt
« Last Edit: September 28, 2010, 09:39:42 pm by calcdude84se »
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Offline Deep Toaster

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Re: Knight Filesystem Specification
« Reply #14 on: September 28, 2010, 09:41:57 pm »
Oh, okay. And just wondering: If it were to delete vars instead of marking them for garbage, would that be more damaging to the flash chip? Meaning does each write to it do just as much wearing no matter how small it is?
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