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【需求】：
在某些场景下，需要在XBL阶段读取分区数据，需要验证xbl阶段方案

这里主要以裸分区为例，比如oem分区。
1、创建一个1MB大小的oem.img，写入内容“test oem partition”
创建方式：

dd if=/dev/null of=oem.img bs=1024 count=1

oem.img内容：

2、XBL阶段读分区方案：
2.1、创建oem_partition_id
在https://www.guidgenerator.com/online-guid-generator.aspx网站自动生成，生成后加入boot_images/QcomPkg/XBLLoader/boot_gpt_partition_id.c文件：

diff --git a/BOOT.XF.4.1/boot_images/QcomPkg/XBLLoader/boot_gpt_partition_id.c b/BOOT.XF.4.1/boot_images/QcomPkg/XBLLoader/boot_gpt_partition_id.c
index bd0b029739..51e7c294da 100755
--- a/BOOT.XF.4.1/boot_images/QcomPkg/XBLLoader/boot_gpt_partition_id.c
+++ b/BOOT.XF.4.1/boot_images/QcomPkg/XBLLoader/boot_gpt_partition_id.c
@@ -223,5 +223,6 @@ struct coldplug_guid aop_recovery_partition_id =/*{B8B27C4C-4B5B-8AB2-502F-A792B590A896}*/{ 0xB8B27C4C, 0x4B5B, 0x8AB2, { 0x50, 0x2F, 0xA7, 0x92, 0xB5, 0x90, 0xA8, 0x96 } };        -
+struct coldplug_guid oem_partition_id = 
+	  { 0x1B15724C, 0x4447, 0x438C, { 0x9B, 0xCB, 0x70, 0x7C, 0x0E, 0x77, 0x5F, 0x6B } };

2.2、增加oem分区
partition_r_ext.xml文件增加oem分区：

diff --git a/QCM2290.LA.3.0/common/config/emmc/partition_r_ext.xml b/QCM2290.LA.3.0/common/config/emmc/partition_r_ext.xml
index 97660152ae..0d53760192 100755
--- a/QCM2290.LA.3.0/common/config/emmc/partition_r_ext.xml
+++ b/QCM2290.LA.3.0/common/config/emmc/partition_r_ext.xml
@@ -95,6 +95,7 @@<partition label="super" size_in_kb="4194304" type="89A12DE1-5E41-4CB3-8B4C-B1441EB5DA38" bootable="false" readonly="false" filename="super.img" sparse="true"/><partition label="privdata1" size_in_kb="102400" type="32AB90B5-5276-4EB8-8EF7-3391E02DE9B1" bootable="false" readonly="false" filename="privdata1.img" sparse="true"/><partition label="privdata2" size_in_kb="102400" type="BCA1B29C-AE01-4C39-8521-D9727CF98BD0" bootable="false" readonly="false" filename="privdata2.img" sparse="true"/>
+		<partition label="oem" size_in_kb="1024" type="1B15724C-4447-438C-9bCB-707C0E775F6B" bootable="false" readonly="false" filename="oem.img" sparse="false"/><partition label="userdata" size_in_kb="4194304" type="1B81E7E6-F50D-419B-A739-2AEEF8DA3335" bootable="false" readonly="false" filename="userdata.img" sparse="true"/></physical_partition></configuration>

2.3、读取oem分区流程

diff --git a/BOOT.XF.4.1/boot_images/QcomPkg/SocPkg/Library/XBLLoaderLib/sbl1_mc.c b/BOOT.XF.4.1/boot_images/QcomPkg/SocPkg/Library/XBLLoaderLib/sbl1_mc.c
index 9310f06ec2..b99fab70f8 100755
--- a/BOOT.XF.4.1/boot_images/QcomPkg/SocPkg/Library/XBLLoaderLib/sbl1_mc.c
+++ b/BOOT.XF.4.1/boot_images/QcomPkg/SocPkg/Library/XBLLoaderLib/sbl1_mc.c
@@ -1360,6 +1360,7 @@ void sbl1_populate_initial_mem_map(bl_shared_data_type* bl_shared_data)*   None* */
+void read_oem_partition(void);void sbl1_tlmm_init(bl_shared_data_type *bl_shared_data){/* Initialize Tlmm and gpio for low power config ,must be done after smem init*/
@@ -1367,6 +1368,7 @@ void sbl1_tlmm_init(bl_shared_data_type *bl_shared_data){BL_VERIFY(FALSE, BL_ERR_INIT_GPIO_FOR_TLMM_CONFIG_FAIL|BL_ERROR_GROUP_BOOT);}  
+  read_oem_partition();}@@ -1632,6 +1634,34 @@ void device_programmer_init (bl_shared_data_type* bl_shared_data, boot_pbl_share}  }+extern uint8 oem_partition_id[];
+void read_oem_partition(void)
+{
+  boot_boolean success = FALSE;
+  boot_flash_trans_if_type *trans_if = NULL;
+  uint8 oem_data_table[1024] = {0};
+  char data[1024] = "0";
+  boot_log_message("hanm:read_oem_partition1 ");
+
+  boot_set_entry_as_img_whitelist((uint64)(&oem_data_table), (uint64)(1024));
+
+  boot_flash_configure_target_image(oem_partition_id);
+  trans_if = boot_flash_dev_open_image(GEN_IMG);
+
+  if (trans_if != NULL) {
+    success = boot_flash_trans_read(trans_if,
+	                                oem_data_table,
+									0,
+									1024,
+									IMAGE_BODY_TYPE);
+
+	boot_log_message("hanm:read_oem_partition2");
+	snprintf(data, 1024, "%s", oem_data_table);
+	boot_log_message(data);
+	boot_flash_dev_close_image(&trans_if);
+  }
+}
+/*===========================================================================**  Function :  sbl1_main_ctl** ==========================================================================

启动效果如下：