RE: 64-bit Data Flash Access Problem [MPC8245]
From: Augustine Nebu Philips <hidden>
Date: 2003-09-24 17:34:38
Steve, I tried to use fp assembly instructions (like lfd). But my assembler has problems and doesnt let me generate my binary. I'm sorry I couldnt properly get you... Should I make use of sw floating points..? That means, should I access 64-bit data only through 64-bit operations..? Thanks and Regards Nebu --------- Original Message --------- DATE: Wed, 24 Sep 2003 13:31:50 From: Steven Blakeslee <redacted>
Are you sure you are not using software floating points?
Subject: 64-bit Data Flash Access Problem [MPC8245] Hi I have a set of 8 1GB data flash chips (Samsung) on an MPC8245 Ref. Board. These are on a 64-bit bus-mode. -------DBUS_SIZ[0-1]:DBUS_SIZ[2] = 110b ------- All 8 chips are selected by a single chip select (RCS1). Trying a 32-bit read from the Data Address Location after giving the Command to Access the flash IDs, only 4 flashes on a common byte lane seem to be responding. 32-bit writes appear only on the DH[0-31] and not on DL[0-31]. I am not very clear as to: (a) How do we perform writes to send out data out on all 64-bits of the bus..? (b) How would we ideally access 64-bit data through 32- bit reads..? (c) Or must we *have* 64- bit read/write instructions..? many thanks in advance for any response .. Regards Nebu Need a new email address that people can remember Check out the new EudoraMail at http://www.eudoramail.com
Need a new email address that people can remember Check out the new EudoraMail at http://www.eudoramail.com ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/