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Commit 5e0db828 authored by Cylen Yao's avatar Cylen Yao Committed by Todd Poynor
Browse files

libdiskconfig: set MBR signature when creating MBR 



When formatting a blank SD card, it needs to set MBR signature when creating MBR.
If not, the 'format' operation will fail.

Change-Id: I860731243797d4da83f370af52822536983009ee
Signed-off-by: default avatarCylen Yao <cylen.yao@mediatek.com>
parent 8c56cebd

libdiskconfig/config_mbr.c

+27 −0
Original line number Diff line number Diff line
@@ -208,6 +208,26 @@ fail: 
}





static struct write_list *

mk_mbr_sig()

{

    struct write_list *item;

    if (!(item = alloc_wl(sizeof(uint16_t)))) {

        ALOGE("Unable to allocate memory for MBR signature.");

        return NULL;

    }



    {

        /* DO NOT DEREFERENCE */

        struct pc_boot_record *mbr = (void *)PC_MBR_DISK_OFFSET;

        /* grab the offset in mbr where to write mbr signature. */

        item->offset = (loff_t)((uint32_t)((uint8_t *)(&mbr->mbr_sig)));

    }



    *((uint16_t*)item->data) = PC_BIOS_BOOT_SIG;

    return item;

}



struct write_list *

config_mbr(struct disk_info *dinfo)

{
@@ -276,6 +296,13 @@ config_mbr(struct disk_info *dinfo) 
        wlist_add(&wr_list, temp_wr);

    }



    if ((temp_wr = mk_mbr_sig()))

        wlist_add(&wr_list, temp_wr);

    else {

        ALOGE("Cannot set MBR signature");

        goto fail;

    }



    return wr_list;



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