imx233: extend partition window support to be more generic

The new code can select among several types of window (user, system, ...).
Furthermore, the type of partitions to use is selectable in config file.
Currently, two types are support: Freescale style MBR and Creative MBLK

Change-Id: I969d60a3d08f2c9448fb4b9c440051b7801b94cd

1 files changed, 4 insertions, 6 deletions

diff --git a/firmware/target/arm/imx233/sdmmc-imx233.c b/firmware/target/arm/imx233/sdmmc-imx233.c
index a4329b1416..978e5b7247 100644
--- a/firmware/target/arm/imx233/sdmmc-imx233.c
+++ b/firmware/target/arm/imx233/sdmmc-imx233.c
@@ -664,12 +664,10 @@ static int init_drive(int drive)
     /* compute window */
     if((SDMMC_FLAGS(drive) & WINDOW) && imx233_partitions_is_window_enabled())
     {
-        uint8_t mbr[512];
-        int ret = transfer_sectors(drive, 0, 1, mbr, true);
-        if(ret)
-            panicf("Cannot read MBR: %d", ret);
-        ret = imx233_partitions_compute_window(mbr, &window_start[drive],
-            &window_end[drive]);
+        /* NOTE: at this point the window shows the whole disk so raw disk
+         * accesses can be made to lookup partitions */
+        ret = imx233_partitions_compute_window(IF_MD(drive,) IMX233_PART_USER,
+            &window_start[drive], &window_end[drive]);
         if(ret)
             panicf("cannot compute partitions window: %d", ret);
         SDMMC_INFO(drive).numblocks = window_end[drive] - window_start[drive];