On Sunday 30 September 2007 00:49:05 Benjamin Herrenschmidt wrote: > Well, it's possible that they have a too weak pull-up resistor on those > lines, and thus when asserted to 0, a significant current goes through > causing the whole thing to heat up. That heat added to the residual heat > of a hot boot becomes then enough to trigger the temperature sensor > threshold... just one possible explanation.
Possible, yes. > > That's why I thought about some silicon bug. Why only when it's hot? :) > > > > > Also, the other change I made you do turns these into inputs, thus the > > > > The _EN bits are already all cleared, as you can see in my printk dump. > > So clearing them has no effect, of course. > > So the ports are Inputs as default on boot. > > Hrm, that's weird then, because in that case, changing the output bits > shouldn't have any effect, unless maybe on some chips, the EN bits are > flipped. I don't have anything specific about the rv350 tho. > > Can you print which specific DDC register is doing that (it's called > twice right ?) and maybe do a patch preventing that write only for one > of them and let me know if it makes a difference. Here's the log of a working kernel. As you can see, I only removed the write for register 0x60 here. So it only crashes when I clear the bits in this register. (makes sense, as there's nothing to clear in the other one). [ 0.453703] PCI: Enabling device 0000:00:10.0 (0006 -> 0007) [ 0.649319] radeonfb (0000:00:10.0): Invalid ROM signature 303 should be 0xaa55 [ 0.649329] radeonfb: Retrieved PLL infos from Open Firmware [ 0.649340] radeonfb: Reference=27.00 MHz (RefDiv=12) Memory=203.00 Mhz, System=392.00 MHz [ 0.649350] radeonfb: PLL min 12000 max 35000 [ 0.650146] DDC REG 0x00000060 IS 0x00000303 [ 0.793754] i2c-adapter i2c-2: unable to read EDID block. [ 1.013748] i2c-adapter i2c-2: unable to read EDID block. [ 1.233748] i2c-adapter i2c-2: unable to read EDID block. [ 1.310002] DDC REG 0x0000006C IS 0x00000000 [ 1.310007] WRITING [ 1.650506] ieee1394: Host added: ID:BUS[0-00:1023] GUID[001124fffed98036] [ 1.700986] radeonfb: Monitor 1 type LCD found [ 1.700995] radeonfb: EDID probed [ 1.701001] radeonfb: Monitor 2 type no found [ 1.701015] radeonfb: Using Firmware dividers 0x0002008e from PPLL 0 [ 1.701130] radeonfb: Dynamic Clock Power Management enabled [ 1.742608] Console: switching to colour frame buffer device 160x53 [ 1.765577] radeonfb: Backlight initialized (radeonbl0) [ 1.765767] radeonfb (0000:00:10.0): ATI Radeon NP [ 1.776757] Generic RTC Driver v1.07 [ 1.777085] Macintosh non-volatile memory driver v1.1 [ 1.777429] Linux agpgart interface v0.102 [ 1.777739] agpgart: Detected Apple UniNorth 2 chipset -- Greetings Michael. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
