From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 29 Aug 2001 04:16:34 -0800 From: Ethan Benson To: linuxppc-dev@lists.linuxppc.org Subject: Re: firewire screwup Message-ID: <20010829041634.M28241@plato.local.lan> References: <15244.11337.823289.698210@titan.metzler> <15244.47416.198967.661158@titan.metzler> Mime-Version: 1.0 In-Reply-To: ; from tas@mindspring.com on Wed, Aug 29, 2001 at 04:38:51AM -0700 Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Wed, Aug 29, 2001 at 04:38:51AM -0700, Timothy A. Seufert wrote: > > It isn't enough to remove the main battery of a PowerBook -- all Macs > and PowerBooks have a tiny internal backup battery which keeps the > real time clock and NVRAM contents alive when the normal power > sources are not present. You have to disconnect it if you want to > reset anything. You also need to allow time for all capacitors to > fully discharge before the NVRAM is truly cleared (it's battery > backed SRAM, and SRAM can keep its contents alive on microamps of > current). Overnight usually seems to be enough. that won't even work on a NewWorld, since on newworld nvram contents are stored in flash. > It's probably worthwhile to try removing the backup battery -- I can > tell you that I resurrected a Blue&White G3 that would not respond to > anything else. (I had put a value into an OF variable that caused > the system to crash before OF could even respond to Cmd-Opt-P-R.) i did something like that once as well, removing the battery did me no good whatsoever. only entering the backup OpenFirmware image worked and allowed me to reset the nvram. -- Ethan Benson http://www.alaska.net/~erbenson/ ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/