Hi all, in the article Booting ARM Linux : http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html I can see that mem map is passed via ATAG_MEM. However, in the same article it is mentioned that this information can also be passed via kernel command line paramters, mem=<size>[KM][,@<phys_offset>].
However, this does not seem to be true, as "mem" command line parameter seems to be formated like this : mem= n[KMG] (i.e. no offset), regarding to this reference : http://oreilly.com/linux/excerpts/9780596100797/kernel-boot-command-line-parameter-reference.html. Seems like memmap should be used instead. I tried passing the parameters like memmap= n[KMG]@start[KMG] but that had no effect at all - still the same amount of System Ram was read from ATAGS and presented in the system via /proc/iomem. What I needed it to reserve 1MB region for one FIFO at the end of RAM and protect it from the kernel. I tried passing memmap= n[KMG]$start[KMG], but that did not worn neither. So my questions are following : 1) Why commandlines are ignoread and ATAGS are given priority 2) What is the most elegant way to protect one region in RAM : a) By giving less memory with ATAGS_MEM and thus making protected region invisible to Linux, lying to it that RAM is smaller b) By changing somehow linker script c) By changing some configuration variables (which ?) Thanks for the answers and best regards, Drasko _______________________________________________ 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
