Good day all, For the first time I begin working on PPC, and on low level, and right start from boot sequence, one issue puzzled me.
After bootstrap code (zImage) uncompressed the kernel vmLinux to physical memory (say from addr 0), it jumps to the kernel entry point, _start, using physically address. At this time, the MMU is not yet setup to map the kernel virtual address (which is statically linked against base address KERNELBASE) to the physically address. $ nm vmlinux |grep early_init c038b8e0 T early_init _start calls early_init before mmu is on to map the KERNEL_BASE to physically address The question is how "bl early_init" can branch to the early_init entry point, properly, as early_init is still a virtual address? Thanks Jim -- View this message in context: http://www.nabble.com/boottime-kernel-relocation%2C-what-I-missed--tf4072673.html#a11574529 Sent from the linuxppc-embedded mailing list archive at Nabble.com. _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
