From: hychon <hychon@genetel.co.kr>
To: linuxppc-embedded@lists.linuxppc.org
Subject: memory access
Date: Tue, 10 Jul 2001 17:06:54 +0900 [thread overview]
Message-ID: <3B4AB798.687AF994@genetel.co.kr> (raw)
Hi!
I want to make a HDLC driver based on the MPC860T target board
To use SCC2 as hdlc , I was access immr area by following
------------------------------------------------------------------------
if((mem_hdlc = open("/dev/mem", O_RDWR)) < 0){
perror("mem open error\n");
exit(2);
}
mem_addr_hdlc = mmap(0,(64*1024),(PROT_READ|PROT_WRITE),MAP_SHARED,
mem_hdlc,0xFF000000 );
if((int)mem_addr_hdlc < 0 ) {
TRACE("mem_addr_hdlc mmap error\n");
exit(2);
}
IMMR = (immap_t *) mem_addr_hdlc;
-----------------------------------------------------------------------------
I used some rest area of dpmem except buffer descriptor area,
then , system was down.
I want to a way of use some user spaec(memory) for Buffer ( receving
and transmitting data).
how to memory access " from virtual memory to physical memory and from
physical memory to virutal memory " ?
can you hlep me with some example ???
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2001-07-10 8:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-10 8:06 hychon [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-07-10 17:51 memory access Marti, Felix
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