48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
|
Information about the Linux/PPC kernel images
|
||
|
|
=====================================================================
|
||
|
|
|
||
|
|
Please mail me (Cort Dougan, cort@fsmlabs.com) if you have questions,
|
||
|
|
comments or corrections.
|
||
|
|
|
||
|
|
This document is meant to answer several questions I've had about how
|
||
|
|
the PReP system boots and how Linux/PPC interacts with that mechanism.
|
||
|
|
It would be nice if we could have information on how other architectures
|
||
|
|
boot here as well. If you have anything to contribute, please
|
||
|
|
let me know.
|
||
|
|
|
||
|
|
|
||
|
|
1. PReP boot file
|
||
|
|
|
||
|
|
This is the file necessary to boot PReP systems from floppy or
|
||
|
|
hard drive. The firmware reads the PReP partition table entry
|
||
|
|
and will load the image accordingly.
|
||
|
|
|
||
|
|
To boot the zImage, copy it onto a floppy with dd if=zImage of=/dev/fd0h1440
|
||
|
|
or onto a PReP hard drive partition with dd if=zImage of=/dev/sda4
|
||
|
|
assuming you've created a PReP partition (type 0x41) with fdisk on
|
||
|
|
/dev/sda4.
|
||
|
|
|
||
|
|
The layout of the image format is:
|
||
|
|
|
||
|
|
0x0 +------------+
|
||
|
|
| | PReP partition table entry
|
||
|
|
| |
|
||
|
|
0x400 +------------+
|
||
|
|
| | Bootstrap program code + data
|
||
|
|
| |
|
||
|
|
| |
|
||
|
|
+------------+
|
||
|
|
| | compressed kernel, elf header removed
|
||
|
|
+------------+
|
||
|
|
| | initrd (if loaded)
|
||
|
|
+------------+
|
||
|
|
| | Elf section table for bootstrap program
|
||
|
|
+------------+
|
||
|
|
|
||
|
|
|
||
|
|
2. MBX boot file
|
||
|
|
|
||
|
|
The MBX boards can load an elf image, and relocate it to the
|
||
|
|
proper location in memory - it copies the image to the location it was
|
||
|
|
linked at.
|