[RFC] Add option to select MMC hardware partition.

driver/Config.in.nvm

@@ -116,6 +116,31 @@ config FATFS
 	depends on SDCARD
 	default y if SDCARD
 
+choice
+    prompt "MMC partition number"
+	depends on SDCARD
+    default MMC_PART_0
+	help
+	  MMC hardware partition device number on the platform where the
+	  image is stored.  Note that this is not related to any software
+	  defined partition table but instead if we are in the user area, which is
+	  partition 0 or the first boot partition, which is 1 or some other defined
+	  partition.
+
+    config MMC_PART_0
+        bool "User area"
+
+    config MMC_PART_1
+        bool "Boot partition 1"
+
+    config MMC_PART_2
+        bool "Boot partition 2"
+
+	config MMC_PART_CUR
+        bool "Current booting partition"
+
+endchoice
+
 endmenu
 
 if DATAFLASH

driver/mci_media.c

@@ -605,6 +605,7 @@ static int mmc_cmd_send_ext_csd(struct sd_card *sdcard, char *ext_csd)
 #define MMC_EXT_CSD_ACCESS_CLEAR_BITS	0x02
 #define MMC_EXT_CSD_ACCESS_WRITE_BYTE	0x03
 
+#define EXT_CSD_BYTE_BOOT_CONFIG	179
 #define EXT_CSD_BYTE_BUS_WIDTH		183
 #define EXT_CSD_BYTE_HS_TIMING		185
 #define EXT_CSD_BYTE_POWER_CLASS	187
@@ -666,6 +667,9 @@ static int mmc_card_identify(struct sd_card *sdcard)
 	if (sdcard->ddr_support)
 		dbg_printf("MMC: Dual Data Rate supported\n");
 
+	sdcard->boot_partition = (ext_csd[EXT_CSD_BYTE_BOOT_CONFIG] >> 3) & 0x07;
+	dbg_printf("MMC: Current boot partition: %d\n", sdcard->boot_partition);
+
 	return 0;
 }
 
@@ -843,6 +847,30 @@ static int mmc_detect_buswidth(struct sd_card *sdcard)
 
 }
 
+#if defined(CONFIG_MMC_PART_1) || defined(CONFIG_MMC_PART_2) || defined(CONFIG_MMC_PART_CUR)
+static int mmc_partition_select(struct sd_card *sdcard, unsigned int partition)
+{
+	int ret;
+	ret = mmc_cmd_switch_fun(sdcard,
+			MMC_EXT_CSD_ACCESS_CLEAR_BITS,
+			EXT_CSD_BYTE_BOOT_CONFIG,
+			0x07);
+	if (ret)
+		return ret;
+
+	ret = mmc_cmd_switch_fun(sdcard,
+			MMC_EXT_CSD_ACCESS_SET_BITS,
+			EXT_CSD_BYTE_BOOT_CONFIG,
+			partition & 0x07);
+	if (ret)
+		return ret;
+
+	dbg_info("MMC: partition %d selected\n", partition & 0x07);
+
+	return 0;
+}
+#endif
+
 /*-----------------------------------------------------------------*/
 
 /*
@@ -1094,6 +1122,25 @@ static int mmc_initialization(struct sd_card *sdcard)
 			console_printf("MMC: DDR mode could not be enabled: %d\n", ret);
 	}
 
+#ifdef CONFIG_MMC_PART_1
+	ret = mmc_partition_select(sdcard, 1);
+	if (ret) {
+		console_printf("MMC: Select boot partition 1 failed !\n");
+		return ret;
+	}
+#elif CONFIG_MMC_PART_2
+	ret = mmc_partition_select(sdcard, 2);
+	if (ret) {
+		console_printf("MMC: Select boot partition 2 failed !\n");
+		return ret;
+	}
+#elif CONFIG_MMC_PART_CUR
+	ret = mmc_partition_select(sdcard, sdcard->boot_partition);
+	if (ret) {
+		console_printf("MMC: Select current boot partition failed !\n");
+		return ret;
+	}
+#endif
 	return 0;
 }
 

include/mci_media.h

@@ -177,6 +177,7 @@ struct sd_card {
 	unsigned int	ddr_support; /* is this card a DDR according to CARDTYPE */
 	unsigned int	read_bl_len;
 	unsigned int	configured_bus_w; /* bus width which we configured */
+	unsigned int	boot_partition; /* MMC boot partition */
 
 	struct sd_host	*host;