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

xpHD647180X I/O processor

xpbus0 at mainbus0
xp0 at xpbus0

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:

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.

/dev/xp
 

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

ioctl(2)

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

June 12, 2022 NetBSD 10.99