good to know.
I was working back in 2005-2006 with a company that had a 4MB kernel.
At that time I was too inexperienced to work at that level but I thought now I could reproduce their work with some help.
Anyhow for the moment I'll go for 256 MB of ram board just so that I don't worry too much about things that are not yet relevant for me.
But thanks again for the warning.
But since you helped me soo much I have another question.
Is it fisible to change the emulator so that I may visualize the following aspects:
_ address of the currently executed instruction from the guest system
_ if this instruction is a form of jump like call return conditional jump.
_ the address or range of addresses read by this instruction
_ the address or range of addresses written by this instruction
I read some things
about the emulator and if I understood it correctly the emulator breaks the instructions of the gurest platform in micro ops which are then executed on the host operation system.
So I'm asking the question above in the idea that maybe there is also somekind of reordering of these micro instructions.
best regards,
dacian
From: Rob Landley <address@hidden>
To: Herbei Dacian <address@hidden>
Cc: Peter Maydell <address@hidden>; QEmu Devel <address@hidden>
Sent: Sunday, 18 August 2013, 8:00
Subject: Re: [Qemu-devel] minimal linux distribution for qemu
On 08/16/2013 11:17:06 AM, Herbei Dacian wrote:
> my system should run in far less memory. something like 2-4MB.
> but first I need to have a system running so that I can monitor with
> qemu the addresses accessed for read execute and write by the code
> run by the emulator.
> if I reach that is a real big deal.
> dacian
Linux 2.6 and later won't run in 2 megs at all. You can trim it down to
4 megs on a nommu system (the page tables take up too much ram
otherwise), but won't be able to do much.
Really, things like kobjects in the modern kernel take up too much
space. Getting anything to work in 4 megs requires diabling all the
printk
strings at compile time. (The last time I saw somebody do a 4
meg system was CELF in 2006. 32 bit x86.)
Look at the uClinux project. Or try to bolt your app onto uboot and run
it on the bare metal.
Rob