RTEMS 4.7.2 On-Line Library

Non-Volatile Memory Driver Write to a Particular Memory Partition

BSP and Device Driver Development Guide

14.8: Write to a Particular Memory Partition

This corresponds to the driver write call. After validating the minor number and arguments, this call enables writes to the specified memory area by invoking the "enable writes handler", then unprotecting the memory area, and finally actually writing to the indicated memory area. When invoked the argument_block is actually a pointer to the following structure type:

typedef struct {
  rtems_unsigned32   offset;
  void              *buffer;
  rtems_unsigned32   length;
  rtems_unsigned32   status;
}   Non_volatile_memory_Driver_arguments;

The driver writes length bytes from buffer and writes them to the non-volatile memory starting at offset into the partition. The result is returned in status.

After the write operation is complete, the "disable writes handler" is invoked to protect the memory area again.

BSP and Device Driver Development Guide