Advanced settings for COM ports

[Jonathan Anthony]

From device manager, I select communications port COM1,
select the port settings tab and click to view the
advanced settings. Instead of seeing the advanced settings
I get the message:
You must have write privileges in the registry for this
device in order to modify the device's advanced settings.

I can set and save, say, the baud rate for COM1 with no
problem.

Any suggestions?
Thanks

 

[Doug Hoeffel \(eMVP\)]

Jonathon:

Run regedit. Select the following keys:
HKLM\SYSTEM\CurrentControlSet\Enum\Root\*PNP0501\PnPBIOS_14\Device
Parameters
HKLM\SYSTEM\CurrentControlSet\Enum\Root\*PNP0501\PnPBIOS_15\Device
Parameters

Rt. click then Permissions. Allow full control.

HTH... Doug

 

[Jonathan Anthony]

Thanks for that, but there is no *PNP0501\PnPBIOS_14.
There is *PNP0501\1_0_17_0_0_0\Device Parameters only:
DosDeviceName
PollingPeriod
PortName.

There is no permissions.
Any more ideas?

 

[Jonathan Anthony]

Thanks for that, but there is no *PNP0501\PnPBIOS_14.
There is *PNP0501\1_0_17_0_0_0\Device Parameters only:
DosDeviceName
PollingPeriod
PortName

There is no Permissions.
Any more ideas?
Thanks

 

[Doug Hoeffel \(eMVP\)]

Jonathon:

I see the keys that I mentioned for both XP Pro and XP Embedded.

The one that you mention I only see in Win 2K.

HTH... Doug

 

[Andy Allred [MS]]

I believe this has been discussed before, you should review the thread(s) in
the Google archives for this group to see if it's the same issue for the
problem and solution below:

There are 3 missing reg keys from
HKLM\system\currentcontrolset\enum\acpi\pnp0501\2
The missing keys are:
RxFIFO
TxFIFO
ForceFifoEnable

Andy

 

[Jonathan Anthony]

It has been suggested that I add to the registry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\*PNP
0501\1_0_17_0_0_0\Device Parameters]
"SkipEnumerations"=dword:ffffffff
"ForceFifoEnable"=dword:00000001
"RxFIFO"=dword:0000000e
"TxFIFO"=dword:00000010

Hoever I can not add directly.
Do I have to do this in target Designer. If so under what
component.

Many thanks

 

[Doug Hoeffel \(eMVP\)]

Jonathon:

I use the "Standard PC" component so I can't speak for the ACPI registry
keys that Andy [MS] addressed.

My image does not have the 1_0_17_0_0_0 registry key so I'm not sure how
this gets created. In my image, my serial ports are represented by:

HKLM\SYSTEM\CurrentControlSet\Enum\Root\*PNP0501\PnPBIOS_14
and
HKLM\SYSTEM\CurrentControlSet\Enum\Root\*PNP0501\PnPBIOS_15

When you fix the security permissions on the "Device Parameters" key, then
upon selecting the Advanced Settings button, the following items get
created:

ForceFifoEnable
RxFIFO
TxFIFO
.... maybe a few others too ?

You will need to create the SkipEnumeration item yourself I think?

I create and run a reg file post-fba to do this since I have to fix the
registry key permissions first.

HTH... Doug

It has been suggested that I add to the registry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\*PNP
0501\1_0_17_0_0_0\Device Parameters]
"SkipEnumerations"=dword:ffffffff
"ForceFifoEnable"=dword:00000001
"RxFIFO"=dword:0000000e
"TxFIFO"=dword:00000010

Hoever I can not add directly.
Do I have to do this in target Designer. If so under what
component.

Many thanks

-----Original Message-----
Jonathon:

I see the keys that I mentioned for both XP Pro and XP Embedded.

The one that you mention I only see in Win 2K.

HTH... Doug



.

 

[Jonathan Anthony]

Andy

I have tried adding to the registry the following:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\*PNP
0501\1_0_17_0_0_0\Device Parameters]
"SkipEnumerations"=dword:ffffffff
"ForceFifoEnable"=dword:00000001
"RxFIFO"=dword:0000000e
"TxFIFO"=dword:00000010
The regedit simply will not let me do this. Does this
have to be done through embedded studio.

Many thanks

 

[Slobodan Brcin]

You need to change permissions to Device Parameters key so you can write.
Right click on key within regedit, and use Permissions to set your access
rights. (You must be in admin account)

Regards,
Slobodan

Andy

I have tried adding to the registry the following:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\*PNP
0501\1_0_17_0_0_0\Device Parameters]
"SkipEnumerations"=dword:ffffffff
"ForceFifoEnable"=dword:00000001
"RxFIFO"=dword:0000000e
"TxFIFO"=dword:00000010
The regedit simply will not let me do this. Does this
have to be done through embedded studio.

Many thanks

-----Original Message-----
I believe this has been discussed before, you should review the thread(s) in
the Google archives for this group to see if it's the same issue for the
problem and solution below:

There are 3 missing reg keys from
HKLM\system\currentcontrolset\enum\acpi\pnp0501\2
The missing keys are:
RxFIFO
TxFIFO
ForceFifoEnable

Andy
--

This posting is provided "AS IS" with no warranties, and confers no rights.
==========================================================





.

 

[Zirong Wang]

if you set it during the phase 8498, you will have the privilege

Andy

I have tried adding to the registry the following:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\*PNP
0501\1_0_17_0_0_0\Device Parameters]
"SkipEnumerations"=dword:ffffffff
"ForceFifoEnable"=dword:00000001
"RxFIFO"=dword:0000000e
"TxFIFO"=dword:00000010
The regedit simply will not let me do this. Does this
have to be done through embedded studio.

Many thanks

-----Original Message-----
I believe this has been discussed before, you should

review the thread(s) in

the Google archives for this group to see if it's the

same issue for the

problem and solution below:

There are 3 missing reg keys from
HKLM\system\currentcontrolset\enum\acpi\pnp0501\2
The missing keys are:
RxFIFO
TxFIFO
ForceFifoEnable

Andy

confers no rights.

==========================================================


"Jonathan Anthony" <[email protected]>

wrote in message

COM1,
this
no


.

 

[Jonathan Anthony]

Thanks to all who have helped. In case of others who have
the same problem, the answer is:

There is no need to anthing in the registry, from
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum
\Root\*PNP0501
I simply changed permissions to include write so I can
write.
Right click on key within regedit, and use Permissions to
set your access rights. (You must be in admin account).
Opening up the Advanced options under port settings and
clicking OK writes the RxFIFO and TxFIFI settings under
Device Parameters.