BIOS log in coreboot

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MicrosoftInternetExplorer4

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.

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Forensic Consultant
Tribunale di Lecce

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

cell: 339.7968555
skype: vincenzo.di_salvo

[David Hendricks]

On Wed, Nov 22, 2017 at 10:09 AM, [e-mail] <
[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.

There are a few ways you can log stuff in coreboot. Console output can be
stored in DRAM which can later be retrieved from the OS using the `cbmem`
tool, or written to SPI flash (warning: this is for debugging may cause
premature wear). POST codes can be saved to CMOS or sent to an external
device (such as an EC or other microcontroller) that can store them.
There's also an event log which uses a SMBIOS-like record format that is
written to flash.

Run `make menuconfig` and look under "Console" for more details.

[Felix Niederwanger]

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