From mboxrd@z Thu Jan 1 00:00:00 1970 Mime-Version: 1.0 Message-Id: In-Reply-To: <20010829041634.M28241@plato.local.lan> References: <15244.11337.823289.698210@titan.metzler> <15244.47416.198967.661158@titan.metzler> <20010829041634.M28241@plato.local.lan> Date: Wed, 29 Aug 2001 13:48:51 -0700 To: Ethan Benson , linuxppc-dev@lists.linuxppc.org From: "Timothy A. Seufert" Subject: Re: firewire screwup Content-Type: text/plain; charset="us-ascii" ; format="flowed" Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: At 4:16 AM -0800 8/29/01, Ethan Benson wrote: >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. Did work on a New World for me (B&W). Maybe only core99 & later use flash for nvram? I'll have to ask a guy I know at Apple about this. He works with prototype hardware&firmware that have lots of bugs, so the various reset procedures are permanently burned into his brain. -- Tim Seufert ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/