Subject: |
Re: devLib, locationProbe routine |
From: |
Andrew Johnson <[email protected]> |
Date: |
Wed, 26 Oct 1994 14:41:25 BST |
On Wed, 26 Oct 1994 08:36:30 -0600 Marty Kraimer wrote:
> > From [email protected] Wed Oct 26 08:21 CDT 1994
> >
> > Am I right in thinking that the routine locationProbe in devlib returns
> > SUCCESS to indicate that the given address does *not* respond to VME
accesses of
> > any size? I presume the aim here is to indicate that this area of the
memory
> > map is currently not used.
>
> No it returns success (0) only if something responds AND no one else has
> requested something from the rage of addresses requested. Thus ALL non 0
> returns values are errors.
That's not what my version (3.11.4) does - has anyone actually tested it?
->devAddressMap
value = 0 = 0x0
->locationProbe 1, 0x200000
value = 34144265 = 0x2090009
->*0xf0200000
_rsrv_free_clientQ + 0xef24fabc = 0xf0200000: value = -14204673 = 0xff2740ff =
_rsrv_free_clientQ + 0xfe2c3bbb
->locationProbe 2,0x80000000
value = 0 = 0x0
->*0x80000000
0x80000000: value =
Bus Error
Program Counter: 0x00053e1a
Status Register: 0x3000
Access Address : 0x80000000
(I have a card at A24:0x200000, none at A32:0x80000000, no addresses registered)
I presume from your description that a driver should call locationProbe before
calling devRegisterAddress which is probably reasonable (although it means
that devLib has to use sysBusToLocalAdrs twice and there is more work needed
in converting a driver).
- Andrew
,_}\_. Andrew Johnson, Technology Division
/ \ Royal Greenwich Observatory
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