Anna, It is a national holiday in the US, so I am out of the office until Monday when I will be able to send you more details.
I tried to use a Lantronix EDS2100 for an RS-232 data-logging application with remote access. That box has an M68K ColdFire processor, 8MB RAM, 8 MB flash. I used XIP and any other technique I could find to increase RAM. The biggest headache was the Linux 2.6 power-of-2 buddy system memory allocator. I guess in the 2.4 kernel, there was a boxcar memory allocator. That would have been better for such a small memory system. I had to resort to fixing GCC to try to catch stack overflow problems in standard apps (NTP, for time -- no RTC). But, I ran out of time to get the system to run reliably -- it kept locking up because of memory allocation failures due to the power-of-2 memory allocation scheme. I have since discovered PlugPCs and similar systems based on ARM SoCs. Marvell's Kirkwood processors have ~512 MB RAM, and ~512MB-1GB flash -- plus an MMU (no FPU). I am currently prototyping a system using a Glomation GESBC-9G20. That box has an Atmel AT91 SAM processor, 64 MB RAM, 256 MB flash, MMU, no FPU. They have a very inexpensive board (US$35) on their web site (http://www.glomationinc.com) that you might consider. The one I chose has an RS-232 port and an enclosure and power supply, all for about US$100 in the quantities I'll need. The Atmel AT91 SAM processors are not bleeding edge ARM SoCs, but I am able to use a modern U-Boot and Linux 3.2 kernel. I haven't found a drop-in root FS small enough yet. Soon. Larry Baker US Geological Survey 650-329-5608 ba...@usgs.gov On Jul 4, 2013, at 5:32 AM, Anna Fischer (novero/Bochum) wrote: > Hi everyone, > > I was wondering if anyone had any experiences they can share about using XIP > on ucLinux? As far as I can see it is supported for the bootloader, the > kernel and also for applications, if the toolchain supports this. My question > though is if anyone has done any studies on how much memory is really saved > doing XIP. Instead of copying executables to RAM, just .data and .bss > sections of programs are copied to RAM. Also, boot time is usually reduced > when using XIP. However, I'm quite keen to hear about some practical examples > on this and some real numbers on what is exactly saved. Can anyone provide > more information on this? I could not find any resources online. > > Thanks for any pointers. > > Anna > _______________________________________________ > uClinux-dev mailing list > uClinux-dev@uclinux.org > http://mailman.uclinux.org/mailman/listinfo/uclinux-dev > This message was resent by uclinux-dev@uclinux.org > To unsubscribe see: > http://mailman.uclinux.org/mailman/options/uclinux-dev _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
