> On May 19, 2015, at 6:25 AM, KSilva <kaleb.si...@iatecam.org.br> wrote: > > I am developing a UEFI application AND I need list all the files stored in > the USB device. > > I am using the DevicePath Protocol, but I did not get success. > > Someone can help me? >
Don’t search based on device path. Device paths are not designed to be an easy way to search, they are designed to be a way to store in NVRAM the exact path to the boot device. A device path is designed so that it is still valid even after a reconfiguration, so it does not even include things like a PCI bus (it could change if you plugged another PCI card in the system). A common mistake is trying to use device path nodes to “match”. You can’t match on a node, you can only match on a device path that exists in the system. The nodes are about how device paths are constructed. A DXE driver will produce a handle with a device path (usually an ACPI node for a PCI root bridge). Then UEFI Driver Model drivers will create children (new handles). On the new child handle a device path is installed, it is a copy of the parents device path with new node(s) describing the child added. What you want to do is gBS->LocateHandleBuffer(), ByProtocol, on the gEfiSimpleFileSystemProtocolGuid. This will give you an array of EFI_HANDLE. You can gBS->HandleProtocol() to get the device path protocol on these handles if you want to figure out which one is on a USB Device. Another common thing to do is find files from the same device your application was loaded from. This can be done via the EFI_LOADED_IMAGE_PROTOCOL that is on the image handle (The one passed into the entry point of your code). EFI_LOADED_IMAGE_PROTOCOL.DeviceHandle represents the device your application was loaded from. Thanks, Andrew Fish > > ------------------------------------------------------------------------------ > One dashboard for servers and applications across Physical-Virtual-Cloud > Widest out-of-the-box monitoring support with 50+ applications > Performance metrics, stats and reports that give you Actionable Insights > Deep dive visibility with transaction tracing using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/edk2-devel ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
