Difference between revisions of "SPI"
From FriendlyELEC WiKi
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[[SPI/zh|查看中文]] | [[SPI/zh|查看中文]] | ||
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| + | ==S5P4418== | ||
| + | ====Q: S5P4418的/dev目录下只有一个spidev0.0这个设备节点, 怎么添加spidev1.0==== | ||
| + | 对于3.4内核来说，4418 需要修改 arch/arm/plat-s5p4418/nanopi2/device.c; <br /> | ||
| + | 想要增加一路的话，可先搜索 CONFIG_SPI_SPIDEV , 然后参考已有代码增加另一路的支持; <br /> | ||
| + | 另外，arch/arm/plat-s5p4418/asb/device.c 有 spi2 的支持，修改时可参考; <br /> | ||
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| + | |||
| + | ==H5/H3/H2+== | ||
| + | ===SPI Flash=== | ||
| + | <syntaxhighlight lang="html4strict"> | ||
| + | $ npi-config | ||
| + | 6 Advanced Options| Configure advanced setting | ||
| + | A5 SPI| Enable/Disable SPI | ||
| + | spi0 Enable/Disable spi0[enabled] | ||
| + | spidev0.0| SPI0 char device | ||
| + | spi-2.8'tft| Matrix-2'8_SPI_Key_TFT | ||
| + | spi-flash| SPI0 flash(X) | ||
| + | </syntaxhighlight> | ||
| + | FriendlyElec H5/H3/H2+的Linux-4.14内核集成了"mxicy,mx25l12805d"的SPI Flash驱动，但是默认并没有使能，选择'spi-flash'后即可将其使能, 设置完毕后需要重启系统。<br> | ||
| + | {{Linux-SPIFlash/zh}} | ||
Revision as of 03:33, 15 January 2019
Contents
1 S5P4418
1.1 Q: S5P4418的/dev目录下只有一个spidev0.0这个设备节点, 怎么添加spidev1.0
对于3.4内核来说，4418 需要修改 arch/arm/plat-s5p4418/nanopi2/device.c;
想要增加一路的话，可先搜索 CONFIG_SPI_SPIDEV , 然后参考已有代码增加另一路的支持;
另外，arch/arm/plat-s5p4418/asb/device.c 有 spi2 的支持，修改时可参考;
2 H5/H3/H2+
2.1 SPI Flash
$ npi-config 6 Advanced Options| Configure advanced setting A5 SPI| Enable/Disable SPI spi0 Enable/Disable spi0[enabled] spidev0.0| SPI0 char device spi-2.8'tft| Matrix-2'8_SPI_Key_TFT spi-flash| SPI0 flash(X)
FriendlyElec H5/H3/H2+的Linux-4.14内核集成了"mxicy,mx25l12805d"的SPI Flash驱动，但是默认并没有使能，选择'spi-flash'后即可将其使能, 设置完毕后需要重启系统。
启动Linux系统时，看到类似下面的启动信息则说明SPI Flash被成功检测到了:
m25p80 spi0.0: mx25l12805d (16384 Kbytes) 1 ofpart partitions found on MTD device spi0.0 Creating 1 MTD partitions on "spi0.0": 0x000000000000-0x000001000000 : "spi-flash"
SPI Flash在Linux系统下的使用方法如下:
$ cat /sys/class/mtd/mtd0/size # 以byte为单位 $ cat /sys/class/block/mtdblock0/size # 以sector(512 byte)为单位 $ apt-get install mtd-utils $ flash_eraseall -j /dev/mtd0 # 格式成jffs2的格式 $ mount -t jffs2 /dev/mtdblock0 /mnt $ mkfs.ext4 /dev/mtdblock0 # 也格式化为ext4 $ mount -t ext4 /dev/mtdblock0 /mnt
