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1 | Information about the Linux/PPC kernel images | ||
2 | ===================================================================== | ||
3 | |||
4 | Please mail me (Cort Dougan, cort@fsmlabs.com) if you have questions, | ||
5 | comments or corrections. | ||
6 | |||
7 | This document is meant to answer several questions I've had about how | ||
8 | the PReP system boots and how Linux/PPC interacts with that mechanism. | ||
9 | It would be nice if we could have information on how other architectures | ||
10 | boot here as well. If you have anything to contribute, please | ||
11 | let me know. | ||
12 | |||
13 | |||
14 | 1. PReP boot file | ||
15 | |||
16 | This is the file necessary to boot PReP systems from floppy or | ||
17 | hard drive. The firmware reads the PReP partition table entry | ||
18 | and will load the image accordingly. | ||
19 | |||
20 | To boot the zImage, copy it onto a floppy with dd if=zImage of=/dev/fd0h1440 | ||
21 | or onto a PReP hard drive partition with dd if=zImage of=/dev/sda4 | ||
22 | assuming you've created a PReP partition (type 0x41) with fdisk on | ||
23 | /dev/sda4. | ||
24 | |||
25 | The layout of the image format is: | ||
26 | |||
27 | 0x0 +------------+ | ||
28 | | | PReP partition table entry | ||
29 | | | | ||
30 | 0x400 +------------+ | ||
31 | | | Bootstrap program code + data | ||
32 | | | | ||
33 | | | | ||
34 | +------------+ | ||
35 | | | compressed kernel, elf header removed | ||
36 | +------------+ | ||
37 | | | initrd (if loaded) | ||
38 | +------------+ | ||
39 | | | Elf section table for bootstrap program | ||
40 | +------------+ | ||
41 | |||
42 | |||
43 | 2. MBX boot file | ||
44 | |||
45 | The MBX boards can load an elf image, and relocate it to the | ||
46 | proper location in memory - it copies the image to the location it was | ||
47 | linked at. | ||