On Thu, Jun 19, 2014 at 12:34:24PM -0700, Sanjay Lal wrote: > > On Jun 19, 2014, at 9:27 AM, Aurelien Jarno <aurel...@aurel32.net> wrote: > > > On Tue, Jun 17, 2014 at 11:10:35PM +0100, James Hogan wrote: > >> In KVM mode the bootrom is loaded and executed from the last 1MB of > >> DRAM. > > > > What is the reason for that? I am not opposed to that, but if it is > > really needed, it means that loading a bootloader into the flash area > > (for example YAMON) won't work and that this should be forbidden to the > > user. > > > > In trap and emulate mode, both the kernel and userland run in user mode on > the processor. Virtual addresses >= 0x80000000 are only accessible in kernel > mode, and the default flash area (VA: 0xbfc00000/PA: 0x1fc00000) falls in > this range. > > We therefore decided to relocate the bootloader to the last 1MB of RAM. This > area is excluded from the RAM ranges supplied to the kernel, so it should not > be accessible to the user. >
Thanks for the explanation. It means we should disable the support for booting from the flash (using -pflash) in KVM mode, as it would simply not work. -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurel...@aurel32.net http://www.aurel32.net -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
