From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from jeeves.momenco.com ([64.169.228.99] helo=host099.momenco.com ident=root) by pentafluge.infradead.org with esmtp (Exim 4.14 #3 (Red Hat Linux)) id 19DVfQ-0004Iw-1K for ; Wed, 07 May 2003 21:37:32 +0100 Received: from beagle (natbox.momenco.com [64.169.228.98]) (authenticated) by host099.momenco.com (8.11.6/8.11.6) with ESMTP id h47KbkH05190 for ; Wed, 7 May 2003 13:37:46 -0700 From: "Matthew Dharm" To: Date: Wed, 7 May 2003 13:37:46 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Subject: DiskOnChip 2000 128Mb problem List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , I'm porting Linux to our embedded PPC platform. We have a DoC 2000 (apparently known as "Millenium") on the board, and I'm having problems getting the driver working. I'm hoping someone here can help... I think the issue is that the driver doesn't support this part, tho it should (are we really the first to try this?). We're using kernel 2.4.17, upgraded with MTD from CVS as of today. Our DoC is 128MB in size and operates at 3.3 V. Here's our story: The main DoC driver detects the device, but is unable to identify any flash devices. At boot time, it shows: Using configured DiskOnChip probe address 0x70400000 DiskOnChip Millennium found at address 0x70400000 No flash chips recognised. NFTL driver: nftlcore.c $Revision: 1.88 $, nftlmount.c $Revision: 1.31 $ And /proc/mtd shows no entries. If I switch to the Millenium-only driver, (config change and edit docprobe.c), we get: Using configured DiskOnChip probe address 0x70400000 DiskOnChip Millennium found at address 0x70400000 Flash chip found: Manufacturer ID: EC, Chip ID: 76 (Samsung:NAND 64MB 3,3V) 1 flash chips found. Total DiskOnChip size: 64 MiB mtd: Giving out device 0 to DiskOnChip Millennium NFTL driver: nftlcore.c $Revision: 1.88 $, nftlmount.c $Revision: 1.31 $ NFTL_notify_add for DiskOnChip Millennium mtd->read = c00cd470, size = 67108864, erasesize = 8192 NFTL_setup Could not find valid boot record Could not mount NFTL device And, in /proc/mtd: # cat /proc/mtd dev: size erasesize name mtd0: 04000000 00002000 "DiskOnChip Millennium" Which is interesting, because it is exactly half the correct size. A quick check through the source code shows that MAX_CHIPS_MIL is set to 1, and there is a FIXME in doc2001.c "to deal with multi-flash on multi-Millenium case more carefully". If I change the definition of MAX_CHIPS_MIL to 4, we get: Using configured DiskOnChip probe address 0x70400000 DiskOnChip Millennium found at address 0x70400000 Flash chip found: Manufacturer ID: EC, Chip ID: 76 (Samsung:NAND 64MB 3,3V) Flash chip found: Manufacturer ID: EC, Chip ID: 76 (Samsung:NAND 64MB 3,3V) 2 flash chips found. Total DiskOnChip size: 128 MiB mtd: Giving out device 0 to DiskOnChip Millennium NFTL driver: nftlcore.c $Revision: 1.88 $, nftlmount.c $Revision: 1.31 $ NFTL_notify_add for DiskOnChip Millennium mtd->read = c00cd450, size = 134217728, erasesize = 8192 NFTL_setup Could not find valid boot record Could not mount NFTL device # cat /proc/mtd dev: size erasesize name mtd0: 08000000 00002000 "DiskOnChip Millennium" So it looks like the driver can probe and see the multiple flash chips present, but can't seem to actually do anything with them. I didn't really expect that change to make it work, but it does show that I have the right amount of flash in the part Of course, now you ask if the chip is formatted. I believe it is, as the part was tested under VxWorks and data was actually written to it. My understanding is that the format is supposed to be compatible.... I've tried nftldump, but it doesn't seem to generate any output. nftl_format just gives a large number of errors as it tries to format the part. Does anyone have any ideas on where to go from here? Perhaps someone can explain what the FIXME means (if applicable) Matt -- Matthew D. Dharm Senior Software Designer Momentum Computer Inc. 1815 Aston Ave. Suite 107 (760) 431-8663 X-115 Carlsbad, CA 92008-7310 Momentum Works For You www.momenco.com