linux & saturn?
- Thread starter mrkotfw
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linux & saturn?
really?? that would be awesome! 😱
really?? that would be awesome! 😱
antime
Extra Hard Mid Boss
linux & saturn?
You should be able to boot the kernel in the 2MB provided, but squeezing in more might be difficult. There's a project with the aim of reducing the footprint of the kernel for embedded systems, they've produced some patches against the 2.6 kernel. Porting a dedicated embedded OS like eCos would probably be easier.
You should be able to boot the kernel in the 2MB provided, but squeezing in more might be difficult. There's a project with the aim of reducing the footprint of the kernel for embedded systems, they've produced some patches against the 2.6 kernel. Porting a dedicated embedded OS like eCos would probably be easier.
linux & saturn?
Well, here at the Uni there's some crazy 3rd year students who were contemplating porting Linux to the Ti-83
Anyway, sorta OT, but does anyone know more of that Runix thing on the PSX? It was supposed to be a Linux port and I do remember some talking about it on the PSXdev group, but it went silent afterwards.
Well, here at the Uni there's some crazy 3rd year students who were contemplating porting Linux to the Ti-83
Anyway, sorta OT, but does anyone know more of that Runix thing on the PSX? It was supposed to be a Linux port and I do remember some talking about it on the PSXdev group, but it went silent afterwards.
K
kahuna
linux & saturn?
I'm wondering if NetBSD might be a better choice.
I'm wondering if NetBSD might be a better choice.
antime
Extra Hard Mid Boss
K
kahuna
linux & saturn?
I could use one of those. I keep forgetting where I put my games! 😀
I could use one of those. I keep forgetting where I put my games! 😀
linux & saturn?
Yeah suuure. I've seen fake linux for TI-83, does that count? I bet they don't even know how much memory a TI-83 Plus has, let alone what that number means.
Originally posted by AntiPasta@Jan 30, 2004 @ 11:41 AM
Well, here at the Uni there's some crazy 3rd year students who were contemplating porting Linux to the Ti-83
Anyway, sorta OT, but does anyone know more of that Runix thing on the PSX? It was supposed to be a Linux port and I do remember some talking about it on the PSXdev group, but it went silent afterwards.
Yeah suuure. I've seen fake linux for TI-83, does that count? I bet they don't even know how much memory a TI-83 Plus has, let alone what that number means.
linux & saturn?
Piratero: An MMU allows implementing virtual memory. When you hear that you might think of swapping to HD, but really that's only one application of virtual memory. Virtual memory means that you get to construct your own memory map and control unauthorized accesses to memory. It's hard to explain but basically suppose you have a really simple system that looks like this:
0000-7FFF: RAM
8000-BFFF: VRAM
C000-FFFF: ROM
With an MMU you could write an OS that makes it look like this to an application:
0000-0FFF: RAM
8000-88FF: VRAM
C000-FFFF: ROM
And then set it up so that any access outside these areas generates an interrupt from the MMU rather than completing the operation, transferring control back to the OS. This is what allows modern operating systems to catch runaway pointers etc. without them corrupting data or bringing down the system. What's more, you can then use this same memory map for multiple applications by changing the translation table when switching applications, like so:
App 1
-------
0000-0FFF -> 0000-0FFF
App 2
-------
0000-0FFF -> 1000-1FFF
App 3
-------
0000-0FFF -> 2000-2FFF
and so on until you run out of RAM.
To make a long story short, without an MMU you can forget about implementing any substantial security, protecting the OS from programs, and protecting programs from each other.
Piratero: An MMU allows implementing virtual memory. When you hear that you might think of swapping to HD, but really that's only one application of virtual memory. Virtual memory means that you get to construct your own memory map and control unauthorized accesses to memory. It's hard to explain but basically suppose you have a really simple system that looks like this:
0000-7FFF: RAM
8000-BFFF: VRAM
C000-FFFF: ROM
With an MMU you could write an OS that makes it look like this to an application:
0000-0FFF: RAM
8000-88FF: VRAM
C000-FFFF: ROM
And then set it up so that any access outside these areas generates an interrupt from the MMU rather than completing the operation, transferring control back to the OS. This is what allows modern operating systems to catch runaway pointers etc. without them corrupting data or bringing down the system. What's more, you can then use this same memory map for multiple applications by changing the translation table when switching applications, like so:
App 1
-------
0000-0FFF -> 0000-0FFF
App 2
-------
0000-0FFF -> 1000-1FFF
App 3
-------
0000-0FFF -> 2000-2FFF
and so on until you run out of RAM.
To make a long story short, without an MMU you can forget about implementing any substantial security, protecting the OS from programs, and protecting programs from each other.
antime
Extra Hard Mid Boss
linux & saturn?
If you download the CVS tree from linuxsh.sourceforge.net you'll see it contains some support for the Saturn, but it appears to be very preliminary (look in the directory linuxsh/linux/arch/sh/boards/saturn/). For anyone interested in such a port, this would probably be a good place to start.
If you download the CVS tree from linuxsh.sourceforge.net you'll see it contains some support for the Saturn, but it appears to be very preliminary (look in the directory linuxsh/linux/arch/sh/boards/saturn/). For anyone interested in such a port, this would probably be a good place to start.
