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Main »» Tutorials

OS4.x multiboot at UBoot time  Popular
(Read 10487 times)
Multiboot into different iterations of OS4.x.

a: For this tutorial we assume that the bootvolume with the highest bootpriority contains OS 4.1 and for sake of simplicity it is assumed that the volume name is "OS_4.1:". My system has, but yours may have it named differently.

b: We want to be able to choose a different version of the OS at UBoot time. In this 'tutorial' we assume that we want to be able to have OS 4.0 Final + update as a second option. Again for the sake of simplicity we assume that that iteration resides on volume "OS_4.0_F1:". Again, my system has, but yours may have it named differently.

c: Further, we assume that currently we have booted into OS 4.1.


To achieve our goal, we take these steps:
1 : In "OS_4.1:Kickstart" make a directory with the name of "OS_4.0_F1".

2 : Find out the Exec designation of volume "OS_4.0_F1:" by means of "Information..." (RAmiga + I).

3 : Open up a texteditor (NotePad) and type the outcome of the previous step here. (Something like DH3 or DH7. Note the absence of the colon (:)!)

4 : Save this text as "OS_4.1:Kickstart/OS_4.0_F1/BootDevice"

5 : Close the texteditor

6 : Copy ALL files (and only files) from "OS_4.0_F1:Kickstart" to "OS_4.1:Kickstart"

7 : Load "OS_4.0_F1:Kickstart/KickLayout" into a texteditor

8 : Replace the string "Kickstart/" by "Kickstart/OS_4.0_F1/"

9 : Locate this line:
EXEC Kickstart/OS_4.0_F1/loader

10: Right after that line insert this line:
MODULE Kickstart/OS_4.0_F1/BootDevice


11: Copy this text into the buffer by selecting it all and using (RAmiga + C)

12: Close the texteditor, but DO NOT SAVE THIS FILE!

13: Load "OS_4.1:Kickstart/KickLayout" into a texteditor

14: Set the cursor at the end of this file

15: Now use (RAmiga + V) and paste the contents of the buffer to the end of the file

16: Save the modified file "OS_4.1:Kickstart/KickLayout" back to disk

17: Close the texteditor

18: Now cold reboot and experience the joy of being able to choose from two options to boot from


An excerpt of my "OS_4.1:Kickstart/KickLayout" looks like this:
(Beware: it multiboots into three iterations of the OS!)

; $VER: Kicklayout_AmigaOne 53.1 (16.7.2006)
; Kernel configuration for the AmigaOne
; This file describes how the "Kickstart" image should look like,
; i.e. it describes which modules should be pre-loaded and available
; at boot time.
; Format:
; ~~~~~~
; The file lists one or more configurations.
; Each configuration starts with the LABEL keyword, followed by the
; name of the configuration. The name can be used to specify the
; configuration in the bootloader tool (see Documentation/kernel/
; bootloader.txt). Note that empty lines end one configuration and
; start the next, which means that you must be careful not to leave
; an empty line anywhere unless you are defining multiple configurations.
; Each configuration must have exactly one line with the EXEC keyword.
; This specifies the filename of the main kernel to use. This kernel is
; the absolute minimum required to boot. It contains, among other things,
; exec.library.
; The following lines define additional modules to be loaded into the
; kickstart image. Each of these lines starts with the MODULE keyword
; followed by the filename of the module.
; Configuration name
LABEL AmigaOS4.1
; Exec name
EXEC Kickstart/loader
; PPC native modules
MODULE Kickstart/kernel
MODULE Kickstart/FastFileSystem
MODULE Kickstart/SmartFilesystem
MODULE Kickstart/JXFileSystem
;MODULE Kickstart/a1floppy.device.kmod
MODULE Kickstart/a1ide.device.kmod
MODULE Kickstart/battclock.resource.kmod
MODULE Kickstart/uhci.usbhcd
MODULE Kickstart/hub.usbfd
;MODULE Kickstart/bootmouse.usbfd
;MODULE Kickstart/bootkeyboard.usbfd
MODULE Kickstart/massstorage.usbfd
MODULE Kickstart/ohci.usbhcd

; Configuration name
LABEL AmigaOS4.0_F1
; Exec name
EXEC Kickstart/OS_4.0_F1/loader
MODULE Kickstart/OS_4.0_F1/BootDevice
; PPC native modules
MODULE Kickstart/OS_4.0_F1/kernel
MODULE Kickstart/OS_4.0_F1/FastFileSystem
MODULE Kickstart/OS_4.0_F1/SmartFilesystem
;MODULE Kickstart/OS_4.0_F1/a1floppy.device.kmod
MODULE Kickstart/OS_4.0_F1/a1ide.device.kmod
MODULE Kickstart/OS_4.0_F1/battclock.resource.kmod
MODULE Kickstart/OS_4.0_F1/uhci.usbhcd
MODULE Kickstart/OS_4.0_F1/hub.usbfd
;MODULE Kickstart/OS_4.0_F1/bootmouse.usbfd
;MODULE Kickstart/OS_4.0_F1/bootkeyboard.usbfd

LABEL AmigaOS4.0_F
; Exec name
EXEC Kickstart/OS_4.0_F/loader
MODULE Kickstart/OS_4.0_F/BootDevice
; PPC native modules
MODULE Kickstart/OS_4.0_F/kernel
MODULE Kickstart/OS_4.0_F/FastFileSystem
MODULE Kickstart/OS_4.0_F/SmartFilesystem
;MODULE Kickstart/OS_4.0_F/a1floppy.device.kmod
MODULE Kickstart/OS_4.0_F/a1ide.device.kmod
MODULE Kickstart/OS_4.0_F/battclock.resource.kmod
MODULE Kickstart/OS_4.0_F/uhci.usbhcd
MODULE Kickstart/OS_4.0_F/hub.usbfd
;MODULE Kickstart/OS_4.0_F/bootmouse.usbfd
;MODULE Kickstart/OS_4.0_F/bootkeyboard.usbfd

- OldFart
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