Op 31 mrt 2011, om 19:22 heeft david@xxxxxxx het volgende geschreven: > On Thu, 31 Mar 2011, Russell King - ARM Linux wrote: > >> On Thu, Mar 31, 2011 at 10:54:40AM +0100, Alan Cox wrote: >>> If I boot it on a current PC I'm booting on a multiprocessor system with >>> different timers, totally different IRQ controllers, different keyboard >>> controllers (USB), PCI Express, an IOMMU, NCQ SATA, ACPI, graphics >>> running in shared host memory able to give/take pages from the host, >>> extra instructions, etc etc >>> >>> And the same kernel boots just fine on both just fine. >> >> We've been there for a long time with ARM. Right from the start I had >> a single kernel image which booted over a range of ARM CPUs and >> platforms. >> >> As far as ARM CPU architectures go, today we can have a single kernel >> image which covers ARMv3 to ARMv5, and a separate kernel image which >> covers ARMv6 to ARMv7 including SMP and UP variants. The thing which >> currently stops ARMv3 to ARMv7 all together is the different page table >> layouts, the ASID tagging, the exclusive load/store support for cmpxchg >> and other atomic operations, etc. > > I don't think the push is to get a single kernel image that boots absolutly everywhere. having separate ARM5 and ARM7 kernels doesn't seem to be a big deal to anyone. You mean ARMv5 and ARMv7, right? ARM5 and ARM7 are completely different things. The short, but inaccurate version: ARM9 -> ARMv4t, ARMv5te* ARM11 -> ARMv6* CORTEX-A* -> ARMv7a regards, Koen-- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
