BSP Developer's Guide

VxWorks 5.5
BSP Developer’s Guide
SYS_CLK_RATE_MAX
Defines the maximum rate at which the system clock can run. Unless hardware
constraints dictate otherwise, SYS_CLK_RATE_MAX must be greater than or
equal to 60 Hz.
AUX_CLK_RATE_MIN
Defines the minimum rate at which the auxiliary clock can run. To support
spy( ), AUX_CLK_RATE_MIN must be less than or equal to 100 Hz.
AUX_CLK_RATE_MAX
Defines the maximum rate at which the auxiliary clock can run. To support
spy( ), AUX_CLK_RATE_MAX must be greater than or equal to 100 Hz.
F.5 Non-Volatile Memory
The generic NVRAM and flash drivers reside in the directory target/src/drv/mem.
Included in this directory is templateNvRam.c. This file provides the template
driver to be used as the basis of non-volatile memory drivers, including flash.
However, do not use this template for the optional True Flash File System (TFFS)
product. For TFFS, refer to documentation accompanying special MTD drivers for
flash devices.
All BSPs are required to have some type of non-volatile memory interface, even if
non-volatile memory is not available. The two required routines are
sysNvRamGet( ) and sysNvRamSet( ). These routines both require an offset
parameter. Internally, these routines use the offset parameter as follows:
offset += NV_BOOT_OFFSET; /* boot line begins at = 0 */
if ((offset < 0) || (strLen < 0) || ((offset + strLen) >
NV_RAM_SIZE))
return (ERROR);
Thus, the offset parameter is biased so that an offset of 0 points to the first byte of
the VxWorks boot line. This is always true even if the boot line is not at the
beginning of the non-volatile memory area.
All BSPs must define the following macros:
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