On Sun, May 19, 2002 at 12:23:37PM -0700, Ralf Baechle wrote: > On Wed, May 15, 2002 at 02:34:47PM -0700, Matthew Dharm wrote: > > What does it take to do a 64-bit port? The first problem I see is the > > boot loader -- do I have to be in 64-bit mode when the kernel starts, > > or can I start in 32-bit mode and then transfer to 64-bit mode? > > Same loader as before - the build procedure will result in a 32-bit kernel > binary which is loaded to the same old KSEG0 addresses. Call me a bit slow, but... Are you saying that my 32-bit loader (which is designed to load a 32-bit ELF file) will do exactly that... but this 32-bit ELF file has the magic in it to switch to 64-bit internally? Nice... Very nice. I'm used to slick Open Source solutions, but I have to admit that this is a pretty elegant one that solves a great many problems... Matt -- Matthew Dharm Work: mdharm@momenco.com Senior Software Designer, Momentum Computer
