XP(4) (luna68k)

XP(4) | Device Drivers Manual (luna68k) | XP(4)

# NAME

`xp` —
HD647180X I/O processor

# SYNOPSIS

`xpbus0 at mainbus0`
`xp0 at xpbus0`

# DESCRIPTION

The file /dev/xp is an mmap(2) capable interface to the memory area of the HD647180X I/O processor (so-called "XP") on LUNA-I and LUNA-II. Byte offsets in this file are interpreted as relative memory addresses of the I/O processor. The range should be between 0x0 and 0xffff.

The following ioctl(2) call applies to /dev/xp:

`XPIOCDOWNLD` struct xp_download
  Load binary and reset I/O processor.

      struct xp_download {
              u_int    size;
      	u_int8_t *data;
      };

  The size member specifies the loading binary size, in bytes. The data member points to the binary image.

# FILES

/dev/xp

# ERRORS

[`EACCES`]
  The device is opened without write permission.
[`EINVAL`]
  The specified size is 0 or more than the I/O processor's memory size.

# SEE ALSO

ioctl(2)

# HISTORY

The /dev/xp file first appeared in NetBSD 7.1.

June 12, 2022 | NetBSD 10.1