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Richy

Joined: 20 Aug 2014
Posts: 10

Richy 03 Sep 2014, 14:15

I've been struggling with writing FAT32 functions for over a week now. I want something simple: following pointers in the allocation table and reading the clusters to memory, in assembly and compact enough to run in a stage-1 bootloader. But every bug I solve seems to create two more, and while FAT12 is pretty popular with OS developers I find surprisingly little online about using FAT32.

Does anyone here have experience with it? I could use help, or even "cheat" and look at someone's complete and working code.

03 Sep 2014, 14:15

Matrix

Joined: 04 Sep 2004
Posts: 1164
Location: Overflow

Matrix 03 Sep 2014, 14:25

Richy wrote:

I've been struggling with writing FAT32 functions for over a week now. I want something simple: following pointers in the allocation table and reading the clusters to memory, in assembly and compact enough to run in a stage-1 bootloader. But every bug I solve seems to create two more, and while FAT12 is pretty popular with OS developers I find surprisingly little online about using FAT32.

Does anyone here have experience with it? I could use help, or even "cheat" and look at someone's complete and working code.

ftp://ftp.kernel.org/pub/linux/kernel/v3.x/
pick one, for example linux-3.14.17.tar.xz extract, and look at fs directory Wink

i'd go for ext2fs, not fat32, but whatever you want

03 Sep 2014, 14:25

Richy

Joined: 20 Aug 2014
Posts: 10

Richy 03 Sep 2014, 15:00

Matrix wrote:

Richy wrote:
I've been struggling with writing FAT32 functions for over a week now. I want something simple: following pointers in the allocation table and reading the clusters to memory, in assembly and compact enough to run in a stage-1 bootloader. But every bug I solve seems to create two more, and while FAT12 is pretty popular with OS developers I find surprisingly little online about using FAT32.

Does anyone here have experience with it? I could use help, or even "cheat" and look at someone's complete and working code.

ftp://ftp.kernel.org/pub/linux/kernel/v3.x/
pick one, for example linux-3.14.17.tar.xz extract, and look at fs directory
i'd go for ext2fs, not fat32, but whatever you want

Thanks, but this code is in C, not Assembly. It is also a lot more complex and larger than anything I could use in a stage-1 bootloader.

03 Sep 2014, 15:00

Dex4u

Joined: 08 Feb 2005
Posts: 1601
Location: web

Dex4u 05 Sep 2014, 17:50

see here:
http://board.flatassembler.net/topic.php?p=134397#134397

Note: comments in spanish

05 Sep 2014, 17:50

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