On Wed, 31 Jan 2007, Atsushi Nemoto wrote: > I compiled ip27 kernel and really confused... > > head.S: > PTR_LA t0, __bss_start # clear .bss > LONG_S zero, (t0) > > System.map: > a8000000003b6000 A __bss_start > > vmlinux: > a800000000385058: 3c0c003b lui t0,0x3b > a80000000038505c: 658c6000 daddiu t0,t0,24576 > a800000000385060: fd800000 sd zero,0(t0) > > vmlinux.32: > 80385058: 3c0c003b lui t4,0x3b > 8038505c: 658c6000 daddiu t4,t4,24576 > 80385060: fd800000 sd zero,0(t4) > > How does this code work? Isn't address 0x3b6000 in user space? Well, the default config for this machine specifies -msym32 with the load address of 0xa80000000001c000. No wonder it does not work. I suppose the setup for this platform should be more or less like this: ifdef CONFIG_BUILD_ELF64 ifdef CONFIG_MAPPED_KERNEL load-$(CONFIG_SGI_IP27) += 0xc00000004001c000 dataoffset-$(CONFIG_SGI_IP27) += 0x01000000 else load-$(CONFIG_SGI_IP27) += 0xa80000000001c000 endif else ifdef CONFIG_MAPPED_KERNEL load-$(CONFIG_SGI_IP27) += 0xffffffffc001c000 OBJCOPYFLAGS := --change-addresses=0xc000000080000000 dataoffset-$(CONFIG_SGI_IP27) += 0x01000000 else load-$(CONFIG_SGI_IP27) += 0xffffffff8001c000 OBJCOPYFLAGS := --change-addresses=0xa800000080000000 endif endif I can cook a patch if some SGI expert steps in and comments whether this makes sense from the platform point of view or not. Maciej
