> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Roman Yeryomin > Sent: Tuesday, November 04, 2008 10:39 AM > To: [email protected] > Subject: [coreboot] and/or busybox issue with alix2c3 serial console > > I'm experimenting with coreboot (v3) on alix2c3 and still can't get serial > console working. :( It stops right after kernel is done booting (I can see > coreboot, filo and kernel messages just fine). I use openWRT but tried > also > another busybox based distribution (imedialinux) -- same problem. With > original tinybios no problem. At the same time I tried voyage linux > (without > busybox) with corebooted alix and it has no such problem. It's obvious > that > this problem cannot be identified as 100% busybox's (why then it works on > tinybios?). > While digging coreboot sources I've noticed that uart initialization is > done > twice for this board -- once in /southbridge/amd/cs5536/cs5536.c (based on > dts config) and second time in /mainboard/pcengines/alix2c3/stage1.c. > I tried playing with these (and /southbridge/amd/cs5536/stage1.c), > disabling > one code or another, but no luck. > Tried to set MOD bits: > > msr.lo = (1 << 4) | (1 << 5) | (1 << 6); > msr.hi = 0; > wrmsr(MDD_UART1_MOD, msr); > > Also no luck. > Not enabling upper banks, however, makes uart appear in kernel as regular > 16550A (and not as NS16550): > > /* Bit 1 = DEVEN (device enable) > * Bit 4 = EN_BANKS (allow access to the upper banks) > */ > //msr.lo = (1 << 4) | (1 << 1); > msr.lo = 1 << 1; > msr.hi = 0; > > So... where should I go now? I'm really stuck. Begging for help...
We've seen this before on s2892, SimNOW, and other platforms. Has anyone ever nailed this down? I would say that it's definitely not busybox's problem since you don't get any kernel output at all. I didn't know where to look either. Thanks, Myles -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
