On Fri, 2008-09-19 at 18:45 +0200, Sébastien Chrétien wrote: > if I write : > ioremap(0x20000000,0x40000) and ioremap(0x20000000,0x50000) > > Will it crash ?
To give you a rough idea, unless you tweak things like TASK_SIZE, KERNELBASE, CONFIG_LOWMEM_SIZE, etc... and depending on what CPU you use, you can generally count on approx. 200M of virtual space for vmalloc/ioremap, or a bit less. I would additionally recommend against mapping a significant portion of that for your devices as the kernel will need space for its own use by vmalloc. You can increase the amount available here by lowering TASK_SIZE to 2G and KERNELBASE as well, and keeping CONFIG_LOWMEM_SIZE clamped to something like 256M. That will give you a good GB of virtual space if I can still count correctly. (Note, having just looked at the MMU init code for 32 bits, I almost had to puke, Kumar, Josh, we really need to clean that shit up one of these days). Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
