Re: Crc32 Calculation Miss

[Guy Raviv <guyraviv8@gmail.com>]

I need to reach the pre memory code. Is it also loaded to the RAM(even
though it is already been executed?)

On Mon, 11 Jun 2018, 18:44 Gao, Liming, <liming.gao@intel.com> wrote:

> In pre memory, PEI code run in flash. After memory is ready, PEI code will
> be loaded into memory. There is no interface to access the whole flash
> data. But, you can access the firmware image that contains PEI and DXE
> driver. In PEI phase, you can locate FvInfoPpi
> (gEfiPeiFirmwareVolumeInfoPpiGuid) to get FV image base address and size;
> in DXE phase, you can locate FVB protocol
> (gEfiFirmwareVolumeBlockProtocolGuid) to get FV image base address and
> size.
>
>
>
> *From:* Guy Raviv [mailto:guyraviv8@gmail.com]
> *Sent:* Monday, June 11, 2018 4:38 PM
> *To:* Gao, Liming <liming.gao@intel.com>
> *Cc:* edk2-devel@lists.01.org
> *Subject:* Re: [edk2] Crc32 Calculation Miss
>
>
>
> EFI_CALCULATE_CRC32()  just calculate the crc for the given address and
> size.
>
>
>
> my question is whether PEI *code *is loaded into the RAM or not.
>
> if it doesn't which seems reasonable, how can i reach it? some interface
> for accessing the whole flash data.
>
>
>
> Thanks,
>
>
>
> On Mon, Jun 11, 2018 at 5:34 AM Gao, Liming <liming.gao@intel.com> wrote:
>
> Guy:
>
>   Does EFI_CALCULATE_CRC32() cover the flash data that includes PEI
> module?
>
>
>
> Thanks
>
> Liming
>
> *From:* Guy Raviv [mailto:guyraviv8@gmail.com]
> *Sent:* Sunday, June 10, 2018 2:59 PM
> *To:* Gao, Liming <liming.gao@intel.com>
> *Cc:* edk2-devel@lists.01.org
> *Subject:* Re: [edk2] Crc32 Calculation Miss
>
>
>
> Update -  it seems that only in the Pei modules a code change doesn't
> change the crc.
>
> Does it make sense?
>
> if so, is there any interface to calculate the flash data itself in the
> Dxe phase?
>
>
>
> Thanks!
>
> Guy
>
>
>
> On Thu, Jun 7, 2018 at 9:34 AM Guy Raviv <guyraviv8@gmail.com> wrote:
>
> Hi Gao,
>
>
>
> I used the EFI_CALCULATE_CRC32 function from
> edkCompatibilityPkg\Foundation.
>
>
>
> Thanks,
>
>
>
> Guy
>
>
>
> On Wed, Jun 6, 2018 at 6:00 PM, Gao, Liming <liming.gao@intel.com> wrote:
>
> Do you use CalculateCrc32() in BaseLib to calculate CRC32 value for the
> different buffer?
>
>
> > -----Original Message-----
> > From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> Guy Raviv
> > Sent: Wednesday, June 6, 2018 10:18 PM
> > To: edk2-devel@lists.01.org
> > Subject: [edk2] Crc32 Calculation Miss
> >
> > Hi Everyone,
> >
> > I have an odd problem.
> > In a specific module in my code (MRC training), code modification doesn't
> > change the BIOS Crc calculation.
> > 1. i checked in my project's fdf file if the FV base address and region
> > size defined are the same as the parameters i'm putting in the
> calculation.
> > 2. i also compared two different binaries and found they are exactly the
> > same.
> >
> > does anyone have any idea what can be wrong here or where should i check?
> >
> > Thanks,
> > Guy
>
> > _______________________________________________
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> > edk2-devel@lists.01.org
> > https://lists.01.org/mailman/listinfo/edk2-devel
>
>
>
>