On Mar 19, 2013, at 8:39 AM, Grant Likely <grant.lik...@secretlab.ca> wrote:
> On Tue, Mar 19, 2013 at 3:11 PM, Cohen, Eugene <eug...@hp.com> wrote: >> You should be able to squeeze down the GPT header and entry array to reside >> in LBAs 1 to 16 and make the boot partition a real GPT partition as well. I >> didn't see anything in the GPT spec that specifies a minimum entry array >> size so 14 LBAs may be sufficient. > > Okay, that's good to know. I didn't go look at the spec yet and was > going by the scant information that I've found so far. The GPT document is the chapter in the UEFI spec. So it should be clear how it all works after you read that. > I'd like to > know if there is any way to specify the maximum number of partition > entries in the partition table header so that partitioning tools don't > blithely overwrite the firmware image. > What you need to do is make LBA 17 (what ever range the SoC specifies) a GPT partition. You can generate a PartitionTypeGUID that means Arndale magic partition. You can give the partition a 72 character null terminated string name, that tells folks not to move or delete it. You can also set the Attribute for the GPT Partition Entry with the Required Partition bit which implies if the partition is modified the system may not boot. After you do this partitioning tools should recognize that is is not safe to mess around with the Arndale partition. Thanks, Andrew Fish > That said, sharing an eMMC as both the boot device and a general > purpose disk is a support nightmare for real products. Some users will > almost definitely end up bricking the thing by reformatting the eMMC. > I don't think that is a usecase that we want to spend a lot of time > trying to support. > >> Is the hardcoded LBA 17 an eMMC specification thing? It seems the 'e' >> prefix doesn't stand for extensible. :) > > It's an Arndale board thing AFAICT. That's how that particular SoC > want's to use an eMMC or an SD card for loading firmware. > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
