[Coco] [COCO] Putting NitrOS-9 boot track in ROM

[Christopher R. Hawks]

On Sun, 1 Feb 2015 21:04:27 -0600
David Ladd <davidwladd at gmail.com> wrote:

> Hello everyone,
> 
> I thought I would share something with everyone that I have been
> tinkering with.
> 
> Last night I was thinking about NitrOS-9 in ROM, but not the OS9Boot
> file like the docs normally talk about.  I was actually thinking of
> putting the boot track for the given device into ROM.
> 
> The first reason I thought about doing this is saving the 4608 bytes
> that is normally locked out of a given volume used for the boot
> track.  So I figured if I put it into ROM I could gain back that
> space.  Plus this might make it a bit easier to just link LSN0 to a
> specific boot file. Here is my test code thus far:
> ------------------------------*bootrom.asm*
>         org     $C000
> START   EQU     *
>         fcc     "DK"
>         lbra    ENTRY
>         fill    $FF,9*256
> ENTRY   EQU     *
>         ldx     #$2600
>         ldu     #BOOTTRK
> LOOP1   ldd     ,u++
>         std     ,x++
>         cmpu    #BOOTEND
>         bne     LOOP1
>         jmp     $2602
> BOOTTRK EQU     *
>         use     boottrack.asm
> BOOTEND EQU     *
> RMSIZE  EQU     BOOTEND-START
>         fill    $39,$2000-RMSIZE
> ​
> ------------------------------
> Now to create the boottrack.asm file I use the os9 tool from toolshed.
> Example as follows:
> os9 dump -a kernel_becker >boottrack.asm
> 
> Then you just need to run lwasm on bootrom.asm and it will build the
> ROM image of the boot track you selected.
> 
> Now so far I have tested this with becker, CoCoSDC, EmuDisk, and IDE.
> Becker, CoCoSDC, and EmuDisk work fine no problems.  So far I
> couldn't get IDE to work.  I will have to examine the source code for
> boot_ide.asm to see how it works more closely.
> 
> Now the only problem I have ran into thus far is a easy way to update
> the OS9Boot file on a pre-existing volume without writing a boot
> track to the volume.  So far os9gen and cobbler both require writing
> a boot track to the volume.
> 
> What I would like to know if anyone has run across a native
> OS-9/NitrOS-9 utility that will link a file as being the OS9Boot file
> to the information that would need to be set in LSN0?
> 
> Thanks :D
> 
> 
> ​
> ​
> +----------+
> |David Ladd|
> +----------+
> 

os9gen -q=pathtobootfile



Christopher R. Hawks
HAWKSoft
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