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| OSDev Wiki ATA read/write sectors code not working right https://forum.osdev.org/viewtopic.php?f=1&t=33657 |
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| Author: | iProgramInCpp [ Wed Apr 24, 2019 10:48 am ] |
| Post subject: | OSDev Wiki ATA read/write sectors code not working right |
https://wiki.osdev.org/ATA_read/write_sectors Some of the time, it does work, some of the time it does not. I can only read and write in one function, then the code quits working. https://gist.github.com/iProgramMC/8328 ... 9bdfd6909f https://gist.github.com/iProgramMC/8d92 ... 52e7b76b31 The basic code required to test the functions is here. The code returns zeros from the FileOpen function, even though the InitFilesystem function worked beforehand and made a full tree of the filesystem. File system is very simple, you've got the classical BPB boot-sector, then 16 sectors' worth of root directory files, and data area. All other FAT features were stripped down as this is planned to be a read-only file system. Its main purpose is to load other programs into memory. I'm not sure what causes the random halt of the functioning of AtaLbaRead and AtaLbaWrite, but I have a suspicion it may be in regards to the drive not being initialized and such, even though the file system was loaded successfully. Please help? |
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| Author: | iProgramInCpp [ Wed Apr 24, 2019 12:55 pm ] |
| Post subject: | Re: OSDev Wiki ATA read/write sectors code not working right |
Please help! |
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| Author: | alberinfo [ Wed Apr 24, 2019 3:49 pm ] |
| Post subject: | Re: OSDev Wiki ATA read/write sectors code not working right |
i think that you're messing up some code. in the wiki says: Code: mov edx, 0x1f4 mov eax, ebx shr eax, 8 out dx, al and then Code: mov edx, 0x1f4 mov eax, ebx shr eax, 16 out dx, al but instead in your code you're doing: Code: mov edx, 0x1f4 mov eax, ebx shr eax, 16 out dx, al correct me if i'm wrong |
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| Author: | iProgramInCpp [ Thu Apr 25, 2019 6:09 am ] |
| Post subject: | Re: OSDev Wiki ATA read/write sectors code not working right |
I've fixed it. The resulting array is still inconsistent even if I read the same sector over and over. |
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