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lesson 7, reading from disk

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Carlos Fenollosa 2014-10-08 21:05:36 +02:00
parent 6b31ae7e88
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07-bootsector-disk/README.md
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@ -53,6 +53,11 @@ is booting from the right drive and set the drive on `dl` accordingly**
The BIOS sets `dl` to the drive number before calling the bootloader. However, The BIOS sets `dl` to the drive number before calling the bootloader. However,
I found some problems with qemu then booting from the hdd. I found some problems with qemu then booting from the hdd.
Try the flag `-fda` for example, `qemu -fda boot_sect_main.bin` which will set `dl` There are two quick options:
as `0x00`, it seems to work fine then.
1. Try the flag `-fda` for example, `qemu -fda boot_sect_main.bin` which will set `dl`
as `0x00`, it seems to work fine then.
2. Explicitly use the flag `-boot`, e.g. `qemu boot_sect_main.bin -boot c` which
automatically sets `dl` as `0x80` and lets the bootloader read data