DevKit8500D/A User Manual - DMCS Pages for Students
DevKit8500D/A User Manual - DMCS Pages for Students
DevKit8500D/A User Manual - DMCS Pages for Students
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drivers/usb/gadget.<br />
3.5 Introduction of driver<br />
3.5.1 NAND<br />
App, System call<br />
<strong>User</strong><br />
VFS<br />
MTD user module<br />
JFFS2 JFFS Char device Block device<br />
Memory technology device<br />
Generic NAND driver<br />
Kernel<br />
MTD chip driver<br />
NAND flash<br />
chip<br />
driver<br />
CFI flash<br />
er<br />
driv<br />
RAM,ROM<br />
etc<br />
Chips<br />
GPMC module<br />
NAND flash<br />
Hardware<br />
Figure 3.5.1 Modular structure <strong>for</strong> NAND<br />
Solid-state memory used in embedded systems is mainly flash; it is NAND flash in this system.<br />
NAND flash is used as a block device, on which the file system is arranged; interaction between<br />
user and NAND flash is mainly realized by a specific file system. In order to shield difference in<br />
different flash memories, kernel inserts an MTD subsystem between the file system and the<br />
specific flash driver <strong>for</strong> management.<br />
There<strong>for</strong>e, the user accesses NAND flash through the following process:<br />
<strong>User</strong>->System Call->VFS->Block Device Driver->MTD->NAND Flash Driver->NAND Flash。<br />
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