Hi Andrew,
I have initialized the flash device with a FV header at the begining,
struct below. How do I determine that FV protocol was detected on the emmc
device ?
Is there some handle that I should see when I use 'dh' shell command ?
Thanx.
typedef struct {
EFI_FIRMWARE_VOLUME_HEADER FvHdr;
EFI_FV_BLOCK_MAP_ENTRY EndBlockMap;
VARIABLE_STORE_HEADER VarHdr;
} EFI_FVB_MEDIA_HDR;
On Mon, Oct 27, 2014 at 12:54 PM, Andrew Fish <[email protected]> wrote:
>
> On Oct 27, 2014, at 12:11 PM, Narinder Dhillon <[email protected]>
> wrote:
>
> Hi Liming,
>
> Yes, the patch helped and now the initialization is not stuck in a loop.
> When UEFI runs for the first time, eMMC flash device is blank and there
> will not be any information or FVB header. Would UEFI create one ? Or do I
> have to create a volume first before UEFI will start using it ?
>
>
> The assumption is it is formatted, the DXE does not attempt to format the
> volume.
>
> Thanks,
>
> Andrew Fish
>
> Thanx.
>
> On Mon, Oct 27, 2014 at 3:24 AM, Gao, Liming <[email protected]> wrote:
>
>> Hi,
>>
>> DxeCore has FVB notify function to call FVB protocol to check whether a
>> FV image is there. DxeCore will read FV header, then base on header length
>> to read the whole FV header, last check FV header. If your FV is not PI FFS
>> format, its FV header length field is invalid that causes DxeCore wrongly
>> read data. To avoid it, DxeCore could be enhanced to check FV header
>> first, then read full header. Could you apply the attached patch to DxeCore
>> module and check again?
>>
>>
>>
>> Thanks
>>
>> Liming
>>
>> *From:* Narinder Dhillon [mailto:[email protected]]
>> *Sent:* Monday, October 27, 2014 8:44 AM
>> *To:* [email protected]
>> *Subject:* [edk2] Firmware Volume Block Protocol
>>
>>
>>
>> Hi All,
>>
>>
>>
>> I am trying to implement a non-volatile variable storage on a small part
>> of eMMC device. I have implemented the FVB protocol and the 'Read' function
>> is being called with increasing 'Lba' during UEFI boot.
>>
>>
>>
>> Where is the 'Read' function is being called from ? (some sort of
>> initialization code)
>>
>> Why will it not stop ?
>>
>> The 'Read' function is being called with increasing Lba till my board
>> hangs.
>>
>>
>>
>> FvbRead Lba:2 Offset:0, Numbytes:512 0x200
>>
>> FvbRead Lba:3 Offset:0, Numbytes:512 0x200
>>
>> FvbRead Lba:4 Offset:0, Numbytes:512 0x200
>>
>>
>>
>> Thanx.
>>
>>
>>
>>
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>>
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>>
>>
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