Hi,
If you boot from a PI FV image, you can add MdeModulePkg
FvSimpleFileSystemDxe driver, then you can see the bootable EFI image in Shell
env.
Thanks
Liming
From: Andrew Fish [mailto:af...@apple.com]
Sent: Saturday, January 03, 2015 12:55 AM
To: edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] SPI boot support
On Jan 1, 2015, at 11:42 PM, Meenakshi Aggarwal
<meenakshi.aggar...@freescale.com<mailto:meenakshi.aggar...@freescale.com>>
wrote:
Hi,
I want to boot UEFI from SPI flash.
If it is a PI based system you can just boot from an FV (Firmware Volume).
http://www.uefi.org/specifications
The MdePkg UEFI Lib has a function to create a a device path node, File names
for an FV are a EFI_GUID.
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Include/Library/UefiLib.h
/**
Initialize a Firmware Volume (FV) Media Device Path node.
The Framework FwVol Device Path changed to conform to the UEFI 2.0
specification.
This library function abstracts initializing a device path node.
Initialize the MEDIA_FW_VOL_FILEPATH_DEVICE_PATH data structure. This device
path changed in the DXE CIS version 0.92 in a non back ward compatible way to
not conflict with the UEFI 2.0 specification. This function abstracts the
differences from the caller.
If FvDevicePathNode is NULL, then ASSERT().
If NameGuid is NULL, then ASSERT().
@param FvDevicePathNode The pointer to a FV device path node to initialize
@param NameGuid FV file name to use in FvDevicePathNode
**/
VOID
EFIAPI
EfiInitializeFwVolDevicepathNode (
IN OUT MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FvDevicePathNode,
IN CONST EFI_GUID *NameGuid
);
The BDS supports an option of booting the shell from an FV. You can search for
PcdShellFile.
https://svn.code.sf.net/p/edk2/code/trunk/edk2/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c
/**
Build the on flash shell boot option with the handle parsed in.
@param Handle The handle which present the device path to
create
on flash shell boot option
@param BdsBootOptionList The header of the link list which indexed all
current boot options
**/
VOID
EFIAPI
BdsLibBuildOptionFromShell (
IN EFI_HANDLE Handle,
IN OUT LIST_ENTRY *BdsBootOptionList
)
{
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
MEDIA_FW_VOL_FILEPATH_DEVICE_PATH ShellNode;
DevicePath = DevicePathFromHandle (Handle);
//
// Build the shell device path
//
EfiInitializeFwVolDevicepathNode (&ShellNode, PcdGetPtr(PcdShellFile));
DevicePath = AppendDevicePathNode (DevicePath, (EFI_DEVICE_PATH_PROTOCOL *)
&ShellNode);
//
// Create and register the shell boot option
//
BdsLibRegisterNewOption (BdsBootOptionList, DevicePath, L"EFI Internal
Shell", L"BootOrder");
}
Thanks,
Andrew Fish
Kindly tell if there is any support of SPI in UEFI?
Also which protocol to use for writing SPI driver?
Thanks & regards
Meenakshi Aggarwal
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