XP(4) | Device Drivers Manual (luna88k) | XP(4)

# NAME

`xp` — HD647180X I/O processor

# SYNOPSIS

`xp0 at mainbus0`

# 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-88K and LUNA-88K2. 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_char  *data;
      };

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

# FILES

/dev/xp

# ERRORS

[`EINVAL`]
  The specified size is 0 or more than the I/O processor's memory size.
[`ENOMEM`]
  Memory could not be allocated for loading.

# SEE ALSO

ioctl(2)

# HISTORY

The /dev/xp file first appeared in OpenBSD 6.1.

February 11, 2017 | Debian