R: Re: BIOS log in coreboot

Thank very much guys !

Please, I've understood the use of cbmem, however, my question is: how can I read this log from the operating system ? That is, my PC has finished to boot and Linux has taken the control  of the machine. In this situation I want to read the coreboot bios log.
Is it possible this?
How can I do ? Which linux command I need to use to read it ? Or where this log is stored in the filesystem ?

Thanks in advance,

Vincenzo.

Forensic Consultant
Tribunale di Lecce

Studio: Strada di Garibaldi - Contrada Paradisi
73010 Lequile (LE)

cell: 339.7968555
skype: vincenzo.di_salvo

----Messaggio originale----

Da: [e-mail]

Data: 23-nov-2017 8.34

A: "[e-mail]",

Ogg: Re: [coreboot] BIOS log in coreboot

Hi Vincenzo,

I had the same issue just a day ago and solved it with cbmem
 When building coreboot, make sure you have selected the "Send console output to a CBMEM buffer"-option (Run `make menuconfig` and select `Console`) and then use the `cbmem` tool (in `util/cbmem` in the coreboot git repo)

Have a look at the following page https://www.coreboot.org/Cbmem_console

Greetings,
 Felix

On 22/11/17 19:09, 
  [e-mail] wrote:

Hello Guys !

I apologize with you if my question seems silly:

can you tell me if Coreboot stores a log of the POST phase in its EPROM memory ?

If so, is it possible to retrive the log by the Operative System  and read it ?

Thanks in advance.

Vincenzo.

Forensic Consultant

Tribunale di Lecce

Studio: Strada di Garibaldi - Contrada Paradisi

73010 Lequile (LE)

cell: 339.7968555

skype: vincenzo.di_salvo

R: Re: BIOS log in coreboot

[John Lewis]

Hi Vincenzo,

The command is called "cbmem" and it may be part of a coreboot-utils package in distro or failing that you can use it from the utils directory from git cloned coreboot.

Regards,

John.

November 23, 2017 1:16 PM, [e-mail] (mailto:[e-mail]) wrote:
Thank very much guys !

Please, I've understood the use of cbmem, however, my question is: how can I read this log from the operating system ? That is, my PC has finished to boot and Linux has taken the control of the machine. In this situation I want to read the coreboot bios log.
Is it possible this?
How can I do ? Which linux command I need to use to read it ? Or where this log is stored in the filesystem ?

Thanks in advance,

Vincenzo.
Forensic Consultant
Tribunale di Lecce

Studio: Strada di Garibaldi - Contrada Paradisi
73010 Lequile (LE)

cell: 339.7968555
skype: vincenzo.di_salvo
 ----Messaggio originale----
Da: [e-mail] (mailto:[e-mail])
Data: 23-nov-2017 8.34
A: "[e-mail] (mailto:[e-mail])", 
Ogg: Re: [coreboot] BIOS log in coreboot
    Hi Vincenzo,

I had the same issue just a day ago and solved it with cbmem
When building coreboot, make sure you have selected the "Send console output to a CBMEM buffer"-option (Run `make menuconfig` and select `Console`) and then use the `cbmem` tool (in `util/cbmem` in the coreboot git repo)

Have a look at the following page https://www.coreboot.org/Cbmem_console (https://www.coreboot.org/Cbmem_console)

Greetings,
Felix 
On 22/11/17 19:09, [e-mail] (javascript:false) wrote:

Hello Guys !

I apologize with you if my question seems silly:

can you tell me if Coreboot stores a log of the POST phase in its EPROM memory ?

If so, is it possible to retrive the log by the Operative System and read it ?

Thanks in advance.

Vincenzo.

Forensic Consultant
Tribunale di Lecce

Studio: Strada di Garibaldi - Contrada Paradisi
73010 Lequile (LE)

cell: 339.7968555
skype: vincenzo.di_salvo

R: Re: BIOS log in coreboot

I believe you also need iomem=relaxed in the kernel command line with 
newer kernels.

R: Re: BIOS log in coreboot

[Vadim Bendebury]

with the right kernel configs the firmware log contents can be seen in
/sys/firmware/log after Linux has booted up.

-vb

On Thu, Nov 23, 2017 at 5:12 AM, [e-mail] <
[e-mail]> wrote:
> Thank very much guys !
>
> Please, I've understood the use of cbmem, however, my question is: how can
> I read this log from the operating system ? That is, my PC has finished to
> boot and Linux has taken the control  of the machine. In this situation I
> want to read the coreboot bios log.
> Is it possible this?
> How can I do ? Which linux command I need to use to read it ? Or where
> this log is stored in the filesystem ?
>
> Thanks in advance,
>
> Vincenzo.
>
> Forensic Consultant
> Tribunale di Lecce
>
> Studio: Strada di Garibaldi - Contrada Paradisi
> 73010 Lequile (LE)
>
> cell: 339.7968555 <(339)%20796-8555>
> skype: vincenzo.di_salvo
>
> ----Messaggio originale----
> Da: [e-mail]
> Data: 23-nov-2017 8.34
> A: "[e-mail]", <
> [e-mail]>
> Ogg: Re: [coreboot] BIOS log in coreboot
>
> Hi Vincenzo,
>
> I had the same issue just a day ago and solved it with cbmem
> When building coreboot, make sure you have selected the "Send console
> output to a CBMEM buffer"-option (Run `make menuconfig` and select
> `Console`) and then use the `cbmem` tool (in `util/cbmem` in the coreboot
> git repo)
>
> Have a look at the following page https://www.coreboot.org/Cbmem_console
>
> Greetings,
> Felix
>
> On 22/11/17 19:09, [e-mail] wrote:
>
> Hello Guys !
>
> I apologize with you if my question seems silly:
>
> can you tell me if Coreboot stores a log of the POST phase in its EPROM
> memory ?
>
> If so, is it possible to retrive the log by the Operative System  and read
> it ?
>
> Thanks in advance.
>
> Vincenzo.
>
> Forensic Consultant
> Tribunale di Lecce
>
> Studio: Strada di Garibaldi - Contrada Paradisi
> 73010 Lequile (LE)
>
> cell: 339.7968555 <(339)%20796-8555>
> skype: vincenzo.di_salvo