Booting a recent kernel on an IP27 system with R14K nodeboards causes the PROM
to bail:
ttyS0:
Command Monitor. Type "exit" to return to the menu.
>> bootp(): console=ttyS0,9600 root=/dev/md0
Setting $netaddr to 192.168.1.x (from server )
Obtaining from server
9036672+495920 entry: 0xa800000000689300
MMC:
2A 000: *** General Exception on node 0
2A 000: *** EPC: 0xa800000000022178 (0xa800000000022178)
2A 000: *** Press ENTER to continue.
2A 000: POD MSC Unc> why
2A 000: EPC : 0xa800000000022178 (0xa800000000022178)
2A 000: ERREPC : 0xffffffffbfc00ee0 (0xc00000001fc00ee0)
2A 000: CACERR : 0x00000000d6d7ff21
2A 000: Status : 0x0000000024407c80
2A 000: BadVA : 0x0000000000000000 (0x0)
2A 000: RA : 0xa8000000008771cc (0xa8000000008771cc)
2A 000: SP : 0xa80000000081be00
2A 000: A0 : 0x00000000000051a1
2A 000: Cause : 0x000000000000c03c (INT:87------ <Float Pt. Exc>)
2A 000: Reason : 242 (Unexpected General Exception.)
2A 000: POD mode was called from: 0xc00000001fc027ec (0xc00000001fc027ec)
2A 000: POD MSC Unc>
Address 0xa800000022178 centers around line 85 in 4.1.0-rc4's
arch/mips/cpu-probe.c:
85: write_32bit_cp1_register(CP1_STATUS, fcsr0);
a80000000002216c: 3c020003 lui v0,0x3
a800000000022170: 3445ffff ori a1,v0,0xffff
a800000000022174: 00851024 and v0,a0,a1
--> a800000000022178: 44c2f800 ctc1 v0,$31
a80000000002217c: 00000000 nop
Looks like cpu_set_fpu_fcsr_mask() was added in April sometime:
http://git.linux-mips.org/cgit/ralf/linux.git/commit/arch/mips/kernel/cpu-probe.c?id=9b26616c8d9dae53fbac7f7cb2c6dd1308102976
Not sure what else can be gleaned. Seems this version of the R14K (v1.4)
doesn't like that FCSR mask. Don't recall the Octane complaining about this,
but I'll try to double-check tomorrow. It's got a newer rev of R14K silicon.
Might be an errata.
--J
