Al Boldi wrote:
bari wrote:
Who is or will be designing anything with only 2Mb (256KB) of Flash? It's difficult to even find Flash under 4Mb (512KB) in high volume.
Even with 512kb you run a pretty tight ship. And that's most boards today.
The idea here is to keep the LB-footprint as tiny as possible, and not to bloat unnecessarily. Just think about it for a second: A multi-tasking, multi-threaded kernel just to kexec. Wow, talk about bloat.
But, there is another way: Have LB read the payload in raw from USB.
Eric got some pretty good results in stripping the Tiny1 Linux kernel down a few years ago. 220K compressed and 371K uncompressed. http://lkml.org/lkml/2004/1/4/10
Removing all the error messages from the kernel removed about 300k from it alone.
Some recent projects that may be of interest:
Kernel Size Tuning Guide: http://elinux.org/Kernel_Size_Tuning_Guide
Open Test Lab of the CE Linux Forum - results of testing the size of the Linux kernel using different values for configuration options: http://testlab.celinuxforum.org/otlwiki/ConfigSizeTestResultsNutOct1
~3Mb (375KB) is about the smallest I've seen with recent kernels
I haven't even seen any ucLinux kernels striped down to this small a footprint.
Embedded Linux Wiki: http://elinux.org/Main_Page
-Bari