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* configuring lpc register from user space
@ 2019-01-23  0:02 Vijay Khemka
  2019-01-23  1:56 ` Li, Yong B
  2019-01-23  5:22 ` Tony_Ao
  0 siblings, 2 replies; 10+ messages in thread
From: Vijay Khemka @ 2019-01-23  0:02 UTC (permalink / raw)
  To: openbmc

[-- Attachment #1: Type: text/plain, Size: 306 bytes --]

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re: configuring lpc register from user space
  2019-01-23  0:02 configuring lpc register from user space Vijay Khemka
@ 2019-01-23  1:56 ` Li, Yong B
  2019-01-23 18:38   ` Vijay Khemka
  2019-01-24 23:05   ` Amithash Prasad
  2019-01-23  5:22 ` Tony_Ao
  1 sibling, 2 replies; 10+ messages in thread
From: Li, Yong B @ 2019-01-23  1:56 UTC (permalink / raw)
  To: Vijay Khemka, openbmc; +Cc: cheng.c.yang, osk

Hi Vijay,

For the UART routeing, there is a kernel device driver, it will export 
several entities in sysfs, you can adjust the routing.

https://patchwork.ozlabs.org/patch/969238/

Thanks,
Yong
On 1/23/2019 8:02 AM, Vijay Khemka wrote:
>
> Team,
>
> I know /dev/mem is not supported in production, I need to configure 
> some lpc register to route uart output, so please suggest what is the 
> best ways to do the same. Is there any application or driver interface 
> available which can be used to set some lpc register like 0x1E78909C.
>
> Regards
>
> -Vijay
>

^ permalink raw reply	[flat|nested] 10+ messages in thread
* RE: configuring lpc register from user space
  2019-01-23  0:02 configuring lpc register from user space Vijay Khemka
  2019-01-23  1:56 ` Li, Yong B
@ 2019-01-23  5:22 ` Tony_Ao
  2019-01-23 18:25   ` Vijay Khemka
  1 sibling, 1 reply; 10+ messages in thread
From: Tony_Ao @ 2019-01-23  5:22 UTC (permalink / raw)
  To: vijaykhemka, openbmc

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Hi Vijay,

If you want to use devmem to set the specific register, you can append mem.devmem to bootargs and restart the system.

Then you can set the specific register using devmem.
You can refer the below link for details.
https://patchwork.ozlabs.org/patch/982894/

Regards,
Tony

From: openbmc [mailto:openbmc-bounces+tony_ao=wiwynn.com@lists.ozlabs.org] On Behalf Of Vijay Khemka
Sent: Wednesday, January 23, 2019 8:02 AM
To: openbmc@lists.ozlabs.org
Subject: configuring lpc register from user space

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re: configuring lpc register from user space
  2019-01-23  5:22 ` Tony_Ao
@ 2019-01-23 18:25   ` Vijay Khemka
  2019-01-24  1:30     ` Tony_Ao
  0 siblings, 1 reply; 10+ messages in thread
From: Vijay Khemka @ 2019-01-23 18:25 UTC (permalink / raw)
  To: Tony_Ao, openbmc

[-- Attachment #1: Type: text/plain, Size: 1490 bytes --]

Hi Tony,
How do you append this to bootargs, can you please give me some example and I have to enable this in my production code.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Tuesday, January 22, 2019 at 9:22 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

If you want to use devmem to set the specific register, you can append mem.devmem to bootargs and restart the system.

Then you can set the specific register using devmem.
You can refer the below link for details.
https://patchwork.ozlabs.org/patch/982894/<https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_982894_&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=v9MU0Ki9pWnTXCWwjHPVgpnCR80vXkkcrIaqU7USl5g&m=KA69FVnlR8bLEMZ31BR4OQYBvagLgpv1hn8STKGirbo&s=hzAe_Ozp-uao2QqzTI-4i7xWFnFPihbN1lFEqIUy0aA&e=>

Regards,
Tony

From: openbmc [mailto:openbmc-bounces+tony_ao=wiwynn.com@lists.ozlabs.org] On Behalf Of Vijay Khemka
Sent: Wednesday, January 23, 2019 8:02 AM
To: openbmc@lists.ozlabs.org
Subject: configuring lpc register from user space

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re: configuring lpc register from user space
  2019-01-23  1:56 ` Li, Yong B
@ 2019-01-23 18:38   ` Vijay Khemka
  2019-01-24 23:05   ` Amithash Prasad
  1 sibling, 0 replies; 10+ messages in thread
From: Vijay Khemka @ 2019-01-23 18:38 UTC (permalink / raw)
  To: Li, Yong B, openbmc; +Cc: cheng.c.yang, osk

Thanks Yong for this but this patch is still not in repo. Do you know what is pending for approval?

On 1/22/19, 5:56 PM, "Li, Yong B" <yong.b.li@linux.intel.com> wrote:

    Hi Vijay,
    
    For the UART routeing, there is a kernel device driver, it will export 
    several entities in sysfs, you can adjust the routing.
    
    https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_969238_&d=DwICaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=v9MU0Ki9pWnTXCWwjHPVgpnCR80vXkkcrIaqU7USl5g&m=FPjuQE-vH3NllpMZmlCDWa2fXoKbUEFWyMRdjmFez4s&s=ibQDI51HRHoTXy8LbzU8h2XKwukG5Ua4wESbWL1aa9I&e=
    
    Thanks,
    Yong
    On 1/23/2019 8:02 AM, Vijay Khemka wrote:
    >
    > Team,
    >
    > I know /dev/mem is not supported in production, I need to configure 
    > some lpc register to route uart output, so please suggest what is the 
    > best ways to do the same. Is there any application or driver interface 
    > available which can be used to set some lpc register like 0x1E78909C.
    >
    > Regards
    >
    > -Vijay
    >
    
    


^ permalink raw reply	[flat|nested] 10+ messages in thread
* RE: configuring lpc register from user space
  2019-01-23 18:25   ` Vijay Khemka
@ 2019-01-24  1:30     ` Tony_Ao
  2019-01-24 18:35       ` Vijay Khemka
  0 siblings, 1 reply; 10+ messages in thread
From: Tony_Ao @ 2019-01-24  1:30 UTC (permalink / raw)
  To: vijaykhemka, openbmc


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Hi Vijay,

The following steps for your reference.

In BMC OS,

1.      Use fw_printenv to check the bootargs

2.      Use fw_setenv to append mem.devmem=1 to the bootargs
root@tiogapass:~# fw_setenv bootargs console=ttyS4,115200n8 root=/dev/ram rw mem.devmem=1


3.      Use fw_printenv to check the bootargs again

4.      Reboot the BMC system

5.      When BMC is ready, you can use devmem to modify the register values

The snapshots:
[cid:image002.png@01D4B3C7.7B047320]

[cid:image003.png@01D4B3C7.7B047320]


Regards,
Tony

From: Vijay Khemka [mailto:vijaykhemka@fb.com]
Sent: Thursday, January 24, 2019 2:26 AM
To: Tony Ao/WYHQ/Wiwynn; openbmc@lists.ozlabs.org
Subject: Re: configuring lpc register from user space

Hi Tony,
How do you append this to bootargs, can you please give me some example and I have to enable this in my production code.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Tuesday, January 22, 2019 at 9:22 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

If you want to use devmem to set the specific register, you can append mem.devmem to bootargs and restart the system.

Then you can set the specific register using devmem.
You can refer the below link for details.
https://patchwork.ozlabs.org/patch/982894/<https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_982894_&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=v9MU0Ki9pWnTXCWwjHPVgpnCR80vXkkcrIaqU7USl5g&m=KA69FVnlR8bLEMZ31BR4OQYBvagLgpv1hn8STKGirbo&s=hzAe_Ozp-uao2QqzTI-4i7xWFnFPihbN1lFEqIUy0aA&e=>

Regards,
Tony

From: openbmc [mailto:openbmc-bounces+tony_ao=wiwynn.com@lists.ozlabs.org] On Behalf Of Vijay Khemka
Sent: Wednesday, January 23, 2019 8:02 AM
To: openbmc@lists.ozlabs.org
Subject: configuring lpc register from user space

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re: configuring lpc register from user space
  2019-01-24  1:30     ` Tony_Ao
@ 2019-01-24 18:35       ` Vijay Khemka
  2019-01-25  1:58         ` Tony_Ao
  0 siblings, 1 reply; 10+ messages in thread
From: Vijay Khemka @ 2019-01-24 18:35 UTC (permalink / raw)
  To: Tony_Ao, openbmc


[-- Attachment #1.1: Type: text/plain, Size: 2642 bytes --]

Hi Tony,
It is not feasible to set boot parameter and reboot in production release. We need to set some lpc register while system is booting.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Wednesday, January 23, 2019 at 5:31 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

The following steps for your reference.

In BMC OS,

  1.  Use fw_printenv to check the bootargs
  2.  Use fw_setenv to append mem.devmem=1 to the bootargs
root@tiogapass:~# fw_setenv bootargs console=ttyS4,115200n8 root=/dev/ram rw mem.devmem=1


  1.  Use fw_printenv to check the bootargs again
  2.  Reboot the BMC system
  3.  When BMC is ready, you can use devmem to modify the register values

The snapshots:
[cid:image002.png@01D4B3C7.7B047320]

[cid:image003.png@01D4B3C7.7B047320]


Regards,
Tony

From: Vijay Khemka [mailto:vijaykhemka@fb.com]
Sent: Thursday, January 24, 2019 2:26 AM
To: Tony Ao/WYHQ/Wiwynn; openbmc@lists.ozlabs.org
Subject: Re: configuring lpc register from user space

Hi Tony,
How do you append this to bootargs, can you please give me some example and I have to enable this in my production code.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Tuesday, January 22, 2019 at 9:22 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

If you want to use devmem to set the specific register, you can append mem.devmem to bootargs and restart the system.

Then you can set the specific register using devmem.
You can refer the below link for details.
https://patchwork.ozlabs.org/patch/982894/<https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_982894_&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=v9MU0Ki9pWnTXCWwjHPVgpnCR80vXkkcrIaqU7USl5g&m=KA69FVnlR8bLEMZ31BR4OQYBvagLgpv1hn8STKGirbo&s=hzAe_Ozp-uao2QqzTI-4i7xWFnFPihbN1lFEqIUy0aA&e=>

Regards,
Tony

From: openbmc [mailto:openbmc-bounces+tony_ao=wiwynn.com@lists.ozlabs.org] On Behalf Of Vijay Khemka
Sent: Wednesday, January 23, 2019 8:02 AM
To: openbmc@lists.ozlabs.org
Subject: configuring lpc register from user space

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re: configuring lpc register from user space
  2019-01-23  1:56 ` Li, Yong B
  2019-01-23 18:38   ` Vijay Khemka
@ 2019-01-24 23:05   ` Amithash Prasad
  1 sibling, 0 replies; 10+ messages in thread
From: Amithash Prasad @ 2019-01-24 23:05 UTC (permalink / raw)
  To: Li, Yong B, Vijay Khemka, openbmc; +Cc: cheng.c.yang, osk

[-- Attachment #1: Type: text/plain, Size: 242 bytes --]

> For the UART routeing, there is a kernel device driver, it will export
> several entities in sysfs, you can adjust the routing.
> https://patchwork.ozlabs.org/patch/969238/
Looks like this driver never made it into the mainline kernel.

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* RE: configuring lpc register from user space
  2019-01-24 18:35       ` Vijay Khemka
@ 2019-01-25  1:58         ` Tony_Ao
  2019-01-25  2:36           ` Vijay Khemka
  0 siblings, 1 reply; 10+ messages in thread
From: Tony_Ao @ 2019-01-25  1:58 UTC (permalink / raw)
  To: vijaykhemka, openbmc


[-- Attachment #1.1: Type: text/plain, Size: 3494 bytes --]

Hi Vijay,

Maybe you can try this way.
Use ‘mknod -m 660 /dev/mem c 1 1’ to create /dev/mem in the BMC runtime system(This way does not require a system reboot. Please refer to Snapshot#1)
But /dev/mem will disappear when you reboot the system.

So I suggest you can use the mknod to create /dev/mem in the runtime environment.
In order to avoid the /dev/mem disappear when system rebooting, you can use mem.devmem parameters(once you set it, the value will be kept in the flash) to prevent this situation.
You can refer to mem.devmem setting in the previous mail.

Snapshot#1
[cid:image003.png@01D4B48F.40B713D0]

Regards,
Tony

From: Vijay Khemka [mailto:vijaykhemka@fb.com]
Sent: Friday, January 25, 2019 2:35 AM
To: Tony Ao/WYHQ/Wiwynn; openbmc@lists.ozlabs.org
Subject: Re: configuring lpc register from user space

Hi Tony,
It is not feasible to set boot parameter and reboot in production release. We need to set some lpc register while system is booting.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Wednesday, January 23, 2019 at 5:31 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

The following steps for your reference.

In BMC OS,
1.      Use fw_printenv to check the bootargs
2.      Use fw_setenv to append mem.devmem=1 to the bootargs
root@tiogapass:~# fw_setenv bootargs console=ttyS4,115200n8 root=/dev/ram rw mem.devmem=1

3.      Use fw_printenv to check the bootargs again
4.      Reboot the BMC system
5.      When BMC is ready, you can use devmem to modify the register values

The snapshots:
[cid:image002.png@01D4B3C7.7B047320]

[cid:image003.png@01D4B3C7.7B047320]


Regards,
Tony

From: Vijay Khemka [mailto:vijaykhemka@fb.com]
Sent: Thursday, January 24, 2019 2:26 AM
To: Tony Ao/WYHQ/Wiwynn; openbmc@lists.ozlabs.org
Subject: Re: configuring lpc register from user space

Hi Tony,
How do you append this to bootargs, can you please give me some example and I have to enable this in my production code.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Tuesday, January 22, 2019 at 9:22 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

If you want to use devmem to set the specific register, you can append mem.devmem to bootargs and restart the system.

Then you can set the specific register using devmem.
You can refer the below link for details.
https://patchwork.ozlabs.org/patch/982894/<https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_982894_&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=v9MU0Ki9pWnTXCWwjHPVgpnCR80vXkkcrIaqU7USl5g&m=KA69FVnlR8bLEMZ31BR4OQYBvagLgpv1hn8STKGirbo&s=hzAe_Ozp-uao2QqzTI-4i7xWFnFPihbN1lFEqIUy0aA&e=>

Regards,
Tony

From: openbmc [mailto:openbmc-bounces+tony_ao=wiwynn.com@lists.ozlabs.org] On Behalf Of Vijay Khemka
Sent: Wednesday, January 23, 2019 8:02 AM
To: openbmc@lists.ozlabs.org
Subject: configuring lpc register from user space

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re: configuring lpc register from user space
  2019-01-25  1:58         ` Tony_Ao
@ 2019-01-25  2:36           ` Vijay Khemka
  0 siblings, 0 replies; 10+ messages in thread
From: Vijay Khemka @ 2019-01-25  2:36 UTC (permalink / raw)
  To: Tony_Ao, openbmc


[-- Attachment #1.1: Type: text/plain, Size: 3773 bytes --]

Thanks Tony,
I will try that.

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Thursday, January 24, 2019 at 5:58 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

Maybe you can try this way.
Use ‘mknod -m 660 /dev/mem c 1 1’ to create /dev/mem in the BMC runtime system(This way does not require a system reboot. Please refer to Snapshot#1)
But /dev/mem will disappear when you reboot the system.

So I suggest you can use the mknod to create /dev/mem in the runtime environment.
In order to avoid the /dev/mem disappear when system rebooting, you can use mem.devmem parameters(once you set it, the value will be kept in the flash) to prevent this situation.
You can refer to mem.devmem setting in the previous mail.

Snapshot#1
[cid:image003.png@01D4B48F.40B713D0]

Regards,
Tony

From: Vijay Khemka [mailto:vijaykhemka@fb.com]
Sent: Friday, January 25, 2019 2:35 AM
To: Tony Ao/WYHQ/Wiwynn; openbmc@lists.ozlabs.org
Subject: Re: configuring lpc register from user space

Hi Tony,
It is not feasible to set boot parameter and reboot in production release. We need to set some lpc register while system is booting.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Wednesday, January 23, 2019 at 5:31 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

The following steps for your reference.

In BMC OS,
1.      Use fw_printenv to check the bootargs
2.      Use fw_setenv to append mem.devmem=1 to the bootargs
root@tiogapass:~# fw_setenv bootargs console=ttyS4,115200n8 root=/dev/ram rw mem.devmem=1

3.      Use fw_printenv to check the bootargs again
4.      Reboot the BMC system
5.      When BMC is ready, you can use devmem to modify the register values

The snapshots:
[cid:image002.png@01D4B3C7.7B047320]

[cid:image003.png@01D4B3C7.7B047320]


Regards,
Tony

From: Vijay Khemka [mailto:vijaykhemka@fb.com]
Sent: Thursday, January 24, 2019 2:26 AM
To: Tony Ao/WYHQ/Wiwynn; openbmc@lists.ozlabs.org
Subject: Re: configuring lpc register from user space

Hi Tony,
How do you append this to bootargs, can you please give me some example and I have to enable this in my production code.

Regards
-Vijay

From: "Tony_Ao@wiwynn.com" <Tony_Ao@wiwynn.com>
Date: Tuesday, January 22, 2019 at 9:22 PM
To: Vijay Khemka <vijaykhemka@fb.com>, "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: RE: configuring lpc register from user space

Hi Vijay,

If you want to use devmem to set the specific register, you can append mem.devmem to bootargs and restart the system.

Then you can set the specific register using devmem.
You can refer the below link for details.
https://patchwork.ozlabs.org/patch/982894/<https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_982894_&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=v9MU0Ki9pWnTXCWwjHPVgpnCR80vXkkcrIaqU7USl5g&m=KA69FVnlR8bLEMZ31BR4OQYBvagLgpv1hn8STKGirbo&s=hzAe_Ozp-uao2QqzTI-4i7xWFnFPihbN1lFEqIUy0aA&e=>

Regards,
Tony

From: openbmc [mailto:openbmc-bounces+tony_ao=wiwynn.com@lists.ozlabs.org] On Behalf Of Vijay Khemka
Sent: Wednesday, January 23, 2019 8:02 AM
To: openbmc@lists.ozlabs.org
Subject: configuring lpc register from user space

Team,
I know /dev/mem is not supported in production, I need to configure some lpc register to route uart output, so please suggest what is the best ways to do the same. Is there any application or driver interface available which can be used to set some lpc register like 0x1E78909C.

Regards
-Vijay

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^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2019-01-25  2:36 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-01-23  0:02 configuring lpc register from user space Vijay Khemka
2019-01-23  1:56 ` Li, Yong B
2019-01-23 18:38   ` Vijay Khemka
2019-01-24 23:05   ` Amithash Prasad
2019-01-23  5:22 ` Tony_Ao
2019-01-23 18:25   ` Vijay Khemka
2019-01-24  1:30     ` Tony_Ao
2019-01-24 18:35       ` Vijay Khemka
2019-01-25  1:58         ` Tony_Ao
2019-01-25  2:36           ` Vijay Khemka

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