hwitag_find_errata()

Find an erratum for a device

Synopsis:

#include <drvr/hwinfo.h>

int hwitag_find_errata( unsigned hwi_off,
                        unsigned *errata_idx );

Arguments:

hwi_off

The offset into the hwinfo section of the system page for the device, which you can get by calling hwi_find_device().

errata_idx

NULL, or a pointer to a location that holds the index of the erratum that you want to find; see below.

Library:

libdrvr

Use the -l drvr option to qcc to link against this library.

Description:

You can use hwitag_find_errata()() to find one or more errata tags associated with the device at hwi_off in the hwinfo section of the syspage.

You can retrieve all errata by using the errata_idx parameter as follows:

• On the first call, set *errata_idx to 0. The first address (if one exists) is returned.
• You can then continue to call hwitag_find_errata() with the same arguments until it returns -1.
• If you know that there's more than one erratum for the specified device, you can set *errata_idx to the instance number of the desired erratum. If that instance exists, the address is returned. For example, to obtain the third erratum for hwi_off, set *errata_idx to 2 (base-0 indexing applies).
• If you're interested only in the first erratum, you can pass NULL for errata_idx (which is the same as setting *errata_idx to 0).

By convention, startup sets the erratum value to the vendor's chosen erratum number as obtained from the errata documents. Some vendors don't necessarily use a unique erratum number, and so the startup and driver must agree on an erratum value.

Returns:

The errata value, or -1 on error.

Classification:

QNX Neutrino

See also:

hwi_find(), hwi_find_bus(), hwi_find_device(), hwi_find_devicebus(), hwi_find_num_units(), hwi_find_unit(), hwi_tag_find(), hwiattr_get(), hwiattr_get_*(), hwitag_find_busattr(), hwitag_find_clkfreq(), hwitag_find_ivec(), hwitag_find_nicaddr(), hwitag_find_phyaddr()