On Thu, Oct 06, 2022 at 06:38:00PM +0000, Christophe Leroy wrote: > Le 06/10/2022 à 20:22, Segher Boessenkool a écrit : > > Long ago I built kernels that fit together with the boot firmware and a > > root fs (busybox+dropbear essentially) in 4MB, but I doubt we can get > > close to that at all these days :-) > > 4MB, not easy. But 8M still achievable. Well our smaller board has 32M, > we have thousands of it spread all over Europe and have to keep it up to > date ....
The smallest of these systems had 256MB RAM. This 4MB is flash ROM :-) > > What is the overhead if you enable modules but do not use them, these > > days? > > On the 8xx it is mainly the instruction TLB miss handler: I meant just an indicative code size number... 100 bytes, 100kB, 100MB, or something like that :-) And, on 64 bit, which is what the question was about! Segher