Salut, Stanislav, On Mon, 2 Mar 2009 14:14:31 -0800 (PST), Stanislav Sinyagin wrote: > > > What you can fit into 2MB flash is Linux kernel 2.4.x, plus some > > > very limited number of libraries, daemons and utilities. Also, > > > even the newest 2.6.x kernel is permanently popping up with ipv6 > > > improvements and bugfixes. It is physically impossible to run a > > > 2.6.x Linux system from 2MB flash. You can, however, run it from > > > 4MB, and there's even some room for ipv6. The dd-wrt software for > > > Linksys routers seems to support it, but I didn't test it. > > > > A slimmed down NetBSD kernel can fit into 2MB including IPv6 > > support. (You have to put some work into it though.) > > unfortunately, NetBSD is way behind Linux in regards to new hardware > support, especially for those consumer-grade devices. Most of the new > reference boards come with quite poorly designed Linux BSP, and I > haven't heard of any BSD support from the embedded hardware vendors. > > Besides, as I told already, this linux/bsd hacking is for geek > enthusiasts. Consumer electronics vendors will just push new hardware > to the market.
You only claimed before that common IPv6 implementations are hard to
fit onto a small amount of flash memory, which is not true. Also, I do
see many consumer-grade devices capable of running NetBSD without any
modification besides installation, but that's really off-topic.
> I looked into the ipv6 linux kernel sources, and found quite a lot of
> hton/ntoh conversions. Also, for example, subnet mask matching is way
> more complex in foreign endianness :)
I fixed part of a BGP toolchain today and didn't need to do any
extensive byte order conversions on my little-endian netbook, merely
because I was aware of what operations I (can) perform in network byte
order and which I can't.
> ipv6 has many more bytes to swap in the packet header, that's the
> only reason :)
Only 64 of them are ever needed. Woah there, what a coincidence that
most modern CPUs come with 64-bit registers (and those will eventually
end up in the embedded market was well in a couple of years. Well,
not the current CPUs, don't take me by the word, I dare you. :-P).
Tonnerre
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