changelog

MMC 卡的驱动程序

MMC Module Driver Version 1.0

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Copyright (C) 2002 Motorola Semiconductors SuZhou Ltd
 *
 */


FEATURES

- Provide services to access the MMC card through the linux block device driver

HOW TO TEST THE DRIVER
Simply run the autotest script under test directory with the following command:
	sh autotest.mmc

Version 1.0
- Add support for MX21, also using the new toolchain armgcc3.2.3 to compile it.
- Modify the test script to support 2 sdhc sockets testing, and using the general block test program to test the memory read/write operation.
- Built for MX21BSP release version mx21_rel_beat_1.0

Version 0.3.6
- The old MMC / SD driver is split into 2 parts, MMC driver and SD driver. This is the MMC driver which can be only used for MMC card
- Clock stopping and starting sequences are changed as the suggested sequences from designer
- Clock starting is changed from a dead loop to a loop which restarts the clock after time out.
- MMC clock is slowed down to 4Mhz as the dividers must be non-zero ( fastest to be 4Mhz)
- Driver now uses devfs
- Makefile now includes -DSILICON_MASK_0L for 0L44N/45N silicons.  If using a silicon marked 0L, please enable the -DSILICON_MASK_0L C_FLAGS in the Makefile

Version 0.3.4
- The driver now attempts to acquire DMA channel starting from 2 instead of the former 1.
- Commented out the line in _MMCSD_PinConfig() that maximized the slow I/O pad driving because it is found to cause system instability when an LCD panel is connected to the ADS.
- Add SD card write protect function.Please note here, when you want this feature,Here when you mount a write protected card, you must use -o ro option.make sure you have remove R184 in ADS board, and have added R199. Otherwisethere will be some problem when using the new MMC/SD driver.
- Fixed a bug when initializing other brands MMC cards. Note here, you need to remove R44 with MMC cards, and add back R44 with SD card.