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--- resources:tools-software:linuxdsp:docs:linux-kernel-and-drivers:mtd:mtd [21 Jul 2020 07:54] – cathy fang
+++ resources:tools-software:linuxdsp:docs:linux-kernel-and-drivers:mtd:mtd [24 Sep 2020 05:39] (current) – [Configure Linux Kernel] cathy fang
@@ Line 1: / Line 1: @@
-Introduction
+====== Linux MTD Driver ======
+===== Introduction =====
 This section describes the steps required to build and use MTD(Memory Technology Device) subsystem on Linux using an ADSP-SC5xx board.
 The MTD software stack looks like below:
+<code>
-<blockquote>         MTD
+         MTD
 ------------------------
     SPI NOR framework
@@ Line 11: / Line 12: @@
      SPI bus driver
 ------------------------
-      SPI NOR chip</blockquote>
+      SPI NOR chip
+</code>
-Hardware Required
+===== Hardware Setup =====
-An ADSP-SC5xx EZ-Board:
+ An ADSP-SC5xx EZ-Board:
-ADSP-SC589 Ezkit v1.1 and above, or,
+   *ADSP-SC589 Ezkit v1.1 and above, or,
-ADSP-SC584 Ezkit v1.0 and above, or,
+   *ADSP-SC584 Ezkit v1.0 and above, or,
-ADSP-SC573 Ezkit v1.2 (BOM 1.8) and above
+   *ADSP-SC573 Ezkit v1.2 (BOM 1.8) and above
+   *ADSP-SC589 MINI v1.4 and above
+===== Software Configuration =====
+==== Configure Linux Kernel ====
+The following configuration should be done on top of the SC589-ezkit/SC584-ezkit/SC573-ezkit/SC589-mini default configuration.
+Run bitbake linux-adi -c menuconfig and configure the kernel as follows:
+Enable MTD and SPI NOR flash w25x driver.
+<code>
+Device Drivers  --->
+    <*> Memory Technology Device (MTD) support  --->
+        <*>   Command line partition table parsing
+        <*>   Caching block device access to MTD devices
+        <*>   SPI-NOR device support  --->
+        Self-contained MTD device drivers  --->
+            <*> Support most SPI Flash chips (AT26DF, M25P, W25X, ...)
+</code>
+Enable JFFS2 filesystem support.
+<code>
+File systems  --->
+    [*] Miscellaneous filesystems  --->
+        <*>   Journalling Flash File System v2 (JFFS2) support
+</code>
+==== Enable Packages ====
+Enable the mtd-utils and mtd-utils-ubifs support, it's enabled in adsp-sc5xx-full image by default.
+<code>
+vim build/conf/local.conf
+IMAGE_INSTALL_append = "mtd-utils mtd-utils-ubifs"
+</code>
+===== Example =====
+Get the MTD device info.
+<code>
+# cat /proc/mtd
+dev:    size   erasesize  name
+mtd0: 00080000 00001000 "uboot (spi)"
+mtd1: 00580000 00001000 "kernel (spi)"
+mtd2: 00a00000 00001000 "root file system (spi)"
+# mtdinfo
+Count of MTD devices:           3
+Present MTD devices:            mtd0, mtd1, mtd2
+Sysfs interface supported:      yes
+# mtdinfo /dev/mtd0
+mtd0
+Name:                           uboot (spi)
+Type:                           nor
+Eraseblock size:                4096 bytes, 4.0 KiB
+Amount of eraseblocks:          128 (524288 bytes, 512.0 KiB)
+Minimum input/output unit size: 1 byte
+Sub-page size:                  1 byte
+Character device major/minor:   90:0
+Bad blocks are allowed:         false
+Device is writable:             true
+</code>
+Erase the MTD device.
+<code>
+# flash_erase -j -q /dev/mtd1 0 0
+</code>
+Mount the MTD device.
+<code>
+# mount -t jffs2 /dev/mtdblock1 /mnt
+</code>
+Read and Write data to the MTD device.
+<code>
+# echo hello > /mnt/test
+# cat /mnt/test
+hello
+</code>
+Unmount the MTD device.
+<code>
+# umount /mnt
+</code>
-Software Configuration
+----
-The following configuration should be done on top of the SC589-ezkit/SC584-ezkit/SC573-ezkit default configuration.
+**Back to** [[resources:tools-software/linuxdsp/docs/linux-kernel-and-drivers/start|Kernel Features and Device Drivers for ADSP-SC5xx Yocto Linux]]

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