Am Donnerstag, den 28.06.2007, 15:43 +0200 schrieb Daniel Chicco: > Hi All, > > First, sorry for my poor English writing skills. > I´m new in uClinux and I´m designing a CPU board with an ARM processor > (NXP LPC2468 for more details) to run uClinux. > I´m chossing the memory layout for external memories and initially I > selected an SDRAM memory to run uClinux kernel code and a serial flash > to store kernel (that is copied to SDRAM at boot), applications and > data (1 MB of data aproximatelly). Is this schema a good choice to run > uClinux? this is a good choice, if your SDRAM is big enough to hold kernel + apps.
> Another doubt is what are the tradeoffs of choose between an external > memory data bus of 16 bit wide and 32 bits wide?, independently of > memory prices of course. > If you use the 32-bit ARM mode with 16-bit memory, the cpu needs two memory cycles for each instruction fetch. This will make your system slower, 50% in worst case. It is quite usual to use 16-bit only, many ARM7TDMI cpus have a 16-bit external interface only. Regards, Erwin _______________________________________________ uClinux-dev mailing list [email protected] http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by [email protected] To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
