From: Adrien Mazarguil <maz@xxxxxxx> Date: Sun, 7 Nov 2010 14:20:51 +0100 > While trying recent kernels on a Sun Netra AX1105 board, I noticed that the > boot process stopped before init had a chance to run. Using git bisect, I > narrowed this regression down to that commit: ... > On this board, the new prom_nbputchar() fails at some point in the boot > process and no subsequent output is shown. Using either the older function > in place of this one or a static buffer solve that issue. This seems related > to this paragraph in the above commit log: ... > Looks like it is still required by older boards, or maybe something else > needs to be fixed? This is strange because everything works fine until the > first call to schedule() just before the last assembly part of switch_to() > macro. Thanks for tracking down this problem. The real issue is that on older boards, passing larger than 32-bit addresses to prom calls (generally) doesn't work correctly. That's why using a static variable instead of a kernel stack variable fixes the problem. This is a larger can of worms than just these two console I/O routines, let me do the audit and I'll give you a patch to test. Thanks! -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
