当前，Linux下sd/mmc卡的驱动已经实现。需要在此基础上实现，给这个mmc/sd块设备加多个分区。有人会问，那等系统启动后，通过fdisk工具去分区不也可以吗？回答是，本身sd/mmc驱动加载后，只有一个区，而我rootfs就是放在sd卡中，然后kernel 通过sd挂载rootfs的，所以，系统启动后，sd卡处于使用中，好像fdisk对于已经使用的sd卡进行分区，估计也会有些问题的。
所以，就需要在驱动加载过程中，加入多个分区。然后我后期向卡的不同的分区去写东西，就很方便了。插入卡，可以显示类似如下信息（16GB的SD卡）：
[ 3.807124] mmc0: new high speed SDHC card at address 59b4
[ 3.814754] [richard debug] mmc_blk_alloc_req devidx=0,perdev_minors=8,md->disk->first_minor =0
[ 3.824690] mmcblk0: mmc0:59b4 00000 14.9 GiB
[ 3.832774] mmcblk0: p1
[ 3.838205] mmcblk mmc0:59b4: Card claimed for testing.
[ 3.844199] mmc0:59b4: 00000 14.9 GiB
现在要做的，就是对其支持多分区“Check Setup
After rebooting and inserting a SD card you should have a device file like:
/dev/mmcblk0
And a partition on it:
/dev/mmcblk0p1 ”
让人明白，mmcblk0就是mmc block 0和mmcblk0p1就是mmc block 0 partition 1之外，其他的可以说是一无所获，所以，只能去通过上面的信息，搞清楚到底何时去加的/dev/mmcblk0p1，然后在对应的地方加上自己要的多分区。
不过，具体是什么地方输出这些信息的，自己去mmc驱动里面，一直无法找到。而且mmc驱动只是针对host controller而言的，而这些信息输出是在卡插上的时候，识别了卡的之后，才能显示具体信息的。不过，在mmc驱动至少能知道，大概信息，就是在这些函数里面：
mmc_rescan -> mmc_attach_sd - -> mmc_add_card() ->device_add() ->
然后在device_add里面，太多相关的系统函数kobject_add，blocking_notifier_call_chain，device_create_file，device_create_file，device_create_sys_dev_entry，device_add_class_symlinks，device_add_attrs，bus_add_device，device_pm_add，bus_attach_device，。。。。。
所以，实现没法搞清楚，具体是哪个函数具体去实现的底层加了/dev/mmcblk0p1这个节点的。
继续debug，加打印信息，在插入卡后，出现：
[ 3.807124] mmc0: new high speed SDHC card at address 59b4
[ 3.814754] [richard debug] mmc_blk_alloc_req devidx=0,perdev_minors=8,md->disk->first_minor =0
[ 3.824690] mmcblk0: mmc0:59b4 00000 14.9 GiB
[ 3.832774] mmcblk0: p1
[ 3.838205] mmcblk mmc0:59b4: Card claimed for testing.
[ 3.844199] mmc0:59b4: 00000 14.9 GiB
所以，由：
mmcblk0: mmc0:59b4 00000 14.9 GiB
判断是
bus_attach_device(dev);
if (parent)
klist_add_tail(&dev->knode_parent, &parent->klist_children);
去实现的/dev/mmcblk0p1，但是去看了这bus_attach_device和klist_add_tail，也仍然是看不懂具体，不知道哪里去具体实现的。
不过，在看代码过程中，发现 kobject_uevent(&dev->kobj, KOBJ_ADD);
中有个dev->kobj，这个kobj是驱动的一个核心数据结构，其中有个name变量，所以，就想，打印这些kobj的name看看，都是哪些名称所以去掉其他打印，加上这个：
printk("--SD-- 10, obj_name:%s\n", dev->kobj.name);
/drivers/base/core.c:1049: kobject_uevent(&dev->kobj, KOBJ_ADD);
然后debug结果输出是：
[ 3.807124] mmc0: new high speed SDHC card at address 59b4
[ 3.814754] [richard debug] mmc_blk_alloc_req devidx=0,perdev_minors=8,md->disk->first_minor =0
[ 3.824690] mmcblk0: mmc0:59b4 00000 14.9 GiB
[ 3.832774] mmcblk0: p1
[ 3.838205] mmcblk mmc0:59b4: Card claimed for testing.
[ 3.844199] mmc0:59b4: 00000 14.9 GiB
因此，知道了mmcblk0p1是从这里：
mmcblk0: p1
--SD-- 1
--SD-- 10, obj_name:mmcblk0p1
实现的，但是仍旧不知道是哪些函数调用到这里的device_add，
此时，由于以前遇到过，dump_stack()函数，知道这个函数可以打印堆栈信息，也就是当前栈上的函数调用信息，所以，此时可以派上用场了。同时，也知道“179:0”是mmc的主次设备号，所以继续debug，加上这些：
/drivers/base/core.c:1049: kobject_uevent(&dev->kobj, KOBJ_ADD);
//kobject_uevent(&dev->kobj, KOBJ_ADD);
if((0==strcmp("mmcblk0p1", dev->kobj.name)) ||
(0==strcmp("mmcblk0", dev->kobj.name)) ||
(0==strcmp("179:0", dev->kobj.name)) ||
(0==strcmp("179:1", dev->kobj.name)) ||
(0==strcmp("179:8", dev->kobj.name)) ||
(0==strcmp("179:9", dev->kobj.name))) {
printk("[richard debug], obj_name:%s\n", dev->kobj.name);
dump_stack();
}
最后打印出来我想要的函数调用信息：
[ 4.456880] --SD-- 10, obj_name:mmcblk0
[ 4.461387] Backtrace:
[ 4.464315] [<c0013410>] (dump_backtrace+0x0/0x110) from [<c0313524>] (dump_stack+0x18/0x1c)
[ 4.473899] r6:00000000 r5:c0e23540 r4:c0e24c50 r3:c045c740
[ 4.480735] [<c031350c>] (dump_stack+0x0/0x1c) from [<c019bef8>] (device_add+0x468/0x614)
[ 4.490004] [<c019ba90>] (device_add+0x0/0x614) from [<c011273c>] (add_disk+0x1a4/0x3d8)
[ 4.504200] [<c0112598>] (add_disk+0x0/0x3d8) from [<c025c0a8>] (mmc_add_disk+0x1c/0xf0)
[ 4.513301] [<c025c08c>] (mmc_add_disk+0x0/0xf0) from [<c025c98c>] (mmc_blk_probe+0x21c/0x28c)
[ 4.523050] r7:c1a15da4 r6:00000001 r5:c0c44000 r4:c0c44400
[ 4.529841] [<c025c770>] (mmc_blk_probe+0x0/0x28c) from [<c0251d74>] (mmc_bus_probe+0x1c/0x20)
[ 4.539510] [<c0251d58>] (mmc_bus_probe+0x0/0x20) from [<c019e26c>] (driver_probe_device+0xd0/0x1f4)
[ 4.549845] [<c019e19c>] (driver_probe_device+0x0/0x1f4) from [<c019e460>] (__device_attach+0x44/0x48)
[ 4.560368] r7:00000000 r6:c019e41c r5:c0c44408 r4:c0489c84
[ 4.567149] [<c019e41c>] (__device_attach+0x0/0x48) from [<c019cb14>] (bus_for_each_drv+0x58/0x94)
[ 4.577197] r5:c1a15e30 r4:c0c44408
[ 4.581556] [<c019cabc>] (bus_for_each_drv+0x0/0x94) from [<c019e148>] (device_attach+0x7c/0xa8)
[ 4.591412] r7:00000000 r6:c0c44408 r5:c0c4443c r4:c0c44408
[ 4.598279] [<c019e0cc>] (device_attach+0x0/0xa8) from [<c019d73c>] (bus_probe_device+0x30/0xa0)
[ 4.608220] r6:c0c44408 r5:c04898b4 r4:c0c44408 r3:00000001
[ 4.615007] [<c019d70c>] (bus_probe_device+0x0/0xa0) from [<c019bf00>] (device_add+0x470/0x614)
[ 4.624850] r6:00000000 r5:c0e23980 r4:c0c44408 r3:00000031
[ 4.631643] [<c019ba90>] (device_add+0x0/0x614) from [<c025220c>] (mmc_add_card+0x17c/0x1d8)
[ 4.641207] [<c0252090>] (mmc_add_card+0x0/0x1d8) from [<c02564c8>] (mmc_attach_sd+0x180/0x204)
[ 4.651051] r6:c0339194 r5:00000000 r4:c1ab0800
[ 4.656571] [<c0256348>] (mmc_attach_sd+0x0/0x204) from [<c0251a5c>] (mmc_rescan+0x200/0x29c)
[ 4.666223] r5:c1ab0800 r4:c1ab09cc
[ 4.670505] [<c025185c>] (mmc_rescan+0x0/0x29c) from [<c004238c>] (process_one_work+0x1e0/0x338)
[ 4.680447] r7:00000000 r6:c025185c r5:c18d3800 r4:c19b6ac0
[ 4.687314] [<c00421ac>] (process_one_work+0x0/0x338) from [<c004316c>] (worker_thread+0x1c0/0x2c8)
[ 4.697553] [<c0042fac>] (worker_thread+0x0/0x2c8) from [<c0046a1c>] (kthread+0x94/0xa0)
[ 4.706644] [<c0046988>] (kthread+0x0/0xa0) from [<c0031d20>] (do_exit+0x0/0x660)
[ 4.715138] r6:c0031d20 r5:c0046988 r4:c1833ed8
[ 4.721147] usbcore: registered new interface driver uvcvideo
[ 4.727744] USB Video Class driver (v1.0.8_SONiX_v2.6.36.04)
--SD-- 10, obj_name:mmcblk0p1
[ 4.754979] Backtrace:
[ 4.757937] [<c0013410>] (dump_backtrace+0x0/0x110) from [<c0313524>] (dump_stack+0x18/0x1c)
[ 4.767522] r6:00000000 r5:c0e3b3c0 r4:c0e24610 r3:c045c740
[ 4.774327] [<c031350c>] (dump_stack+0x0/0x1c) from [<c019bef8>] (device_add+0x468/0x614)
[ 4.783606] [<c019ba90>] (device_add+0x0/0x614) from [<c01144a0>] (add_partition+0x1a8/0x294)
[ 4.793269] [<c01142f8>] (add_partition+0x0/0x294) from [<c011479c>] (rescan_partitions+0x210/0x280)
[ 4.808619] [<c011458c>] (rescan_partitions+0x0/0x280) from [<c00bb53c>] (__blkdev_get+0x15c/0x368)
[ 4.818774] [<c00bb3e0>] (__blkdev_get+0x0/0x368) from [<c00bb8e4>] (blkdev_get+0x19c/0x294)
[ 4.828342] [<c00bb748>] (blkdev_get+0x0/0x294) from [<c01127f4>] (add_disk+0x25c/0x3d8)
[ 4.837527] [<c0112598>] (add_disk+0x0/0x3d8) from [<c025c0a8>] (mmc_add_disk+0x1c/0xf0)
[ 4.846705] [<c025c08c>] (mmc_add_disk+0x0/0xf0) from [<c025c98c>] (mmc_blk_probe+0x21c/0x28c)
[ 4.856369] r7:c1a15da4 r6:00000001 r5:c0c44000 r4:c0c44400
[ 4.863300] [<c025c770>] (mmc_blk_probe+0x0/0x28c) from [<c0251d74>] (mmc_bus_probe+0x1c/0x20)
[ 4.873066] [<c0251d58>] (mmc_bus_probe+0x0/0x20) from [<c019e26c>] (driver_probe_device+0xd0/0x1f4)
[ 4.883317] [<c019e19c>] (driver_probe_device+0x0/0x1f4) from [<c019e460>] (__device_attach+0x44/0x48)
[ 4.893840] r7:00000000 r6:c019e41c r5:c0c44408 r4:c0489c84
[ 4.900716] [<c019e41c>] (__device_attach+0x0/0x48) from [<c019cb14>] (bus_for_each_drv+0x58/0x94)
[ 4.910850] r5:c1a15e30 r4:c0c44408
[ 4.915119] [<c019cabc>] (bus_for_each_drv+0x0/0x94) from [<c019e148>] (device_attach+0x7c/0xa8)
[ 4.925061] r7:00000000 r6:c0c44408 r5:c0c4443c r4:c0c44408
[ 4.931851] [<c019e0cc>] (device_attach+0x0/0xa8) from [<c019d73c>] (bus_probe_device+0x30/0xa0)
[ 4.941792] r6:c0c44408 r5:c04898b4 r4:c0c44408 r3:00000001
[ 4.948572] [<c019d70c>] (bus_probe_device+0x0/0xa0) from [<c019bf00>] (device_add+0x470/0x614)
[ 4.958418] r6:00000000 r5:c0e23980 r4:c0c44408 r3:00000031
[ 4.965296] [<c019ba90>] (device_add+0x0/0x614) from [<c025220c>] (mmc_add_card+0x17c/0x1d8)
[ 4.974775] [<c0252090>] (mmc_add_card+0x0/0x1d8) from [<c02564c8>] (mmc_attach_sd+0x180/0x204)
[ 4.984617] r6:c0339194 r5:00000000 r4:c1ab0800
[ 4.990240] [<c0256348>] (mmc_attach_sd+0x0/0x204) from [<c0251a5c>] (mmc_rescan+0x200/0x29c)
[ 4.999794] r5:c1ab0800 r4:c1ab09cc
[ 5.004165] [<c025185c>] (mmc_rescan+0x0/0x29c) from [<c004238c>] (process_one_work+0x1e0/0x338)
[ 5.014015] r7:00000000 r6:c025185c r5:c18d3800 r4:c19b6ac0
[ 5.020900] [<c00421ac>] (process_one_work+0x0/0x338) from [<c004316c>] (worker_thread+0x1c0/0x2c8)
[ 5.031152] [<c0042fac>] (worker_thread+0x0/0x2c8) from [<c0046a1c>] (kthread+0x94/0xa0)
[ 5.040332] [<c0046988>] (kthread+0x0/0xa0) from [<c0031d20>] (do_exit+0x0/0x660)
4.121881] mmcblk0: mmc0:59b4 00000 14.9 GiB
[ 4.127111] --SD-- 10, obj_name:179:0
[ 4.131398] Backtrace:
[ 4.134333] [<c0013410>] (dump_backtrace+0x0/0x110) from [<c0313524>] (dump_stack+0x18/0x1c)
[ 4.143894] r6:00000000 r5:c0e236c0 r4:c0e24a00 r3:c045c740
[ 4.150696] [<c031350c>] (dump_stack+0x0/0x1c) from [<c019bef8>] (device_add+0x468/0x614)
[ 4.159964] [<c019ba90>] (device_add+0x0/0x614) from [<c019c0c0>] (device_register+0x1c/0x20)
[ 4.169619] [<c019c0a4>] (device_register+0x0/0x20) from [<c019c13c>] (device_create_vargs+0x78/0xbc)
[ 4.179956] r4:00000000 r3:00000000
[ 4.184315] [<c019c0c4>] (device_create_vargs+0x0/0xbc) from [<c007e6b4>] (bdi_register+0x44/0x14c)
[ 4.199554] r8:00000001 r7:c0e24c0c r6:c0e24c50 r5:c0c44000 r4:c0d1ab90
[ 4.207310] r3:c0d1ab90
[ 4.210518] [<c007e670>] (bdi_register+0x0/0x14c) from [<c007e7ec>] (bdi_register_dev+0x30/0x3c)
[ 4.220454] r3:000000b3 r2:c03bb337
[ 4.224714] r6:c0e24c50 r5:c0c44000 r4:c0e24c00
[ 4.230249] [<c007e7bc>] (bdi_register_dev+0x0/0x3c) from [<c01126f8>] (add_disk+0x160/0x3d8)
[ 4.239909] [<c0112598>] (add_disk+0x0/0x3d8) from [<c025c0a8>] (mmc_add_disk+0x1c/0xf0)
[ 4.249000] [<c025c08c>] (mmc_add_disk+0x0/0xf0) from [<c025c98c>] (mmc_blk_probe+0x21c/0x28c)
[ 4.258749] r7:c1a15da4 r6:00000001 r5:c0c44000 r4:c0c44400
[ 4.265627] [<c025c770>] (mmc_blk_probe+0x0/0x28c) from [<c0251d74>] (mmc_bus_probe+0x1c/0x20)
[ 4.275301] [<c0251d58>] (mmc_bus_probe+0x0/0x20) from [<c019e26c>] (driver_probe_device+0xd0/0x1f4)
[ 4.285638] [<c019e19c>] (driver_probe_device+0x0/0x1f4) from [<c019e460>] (__device_attach+0x44/0x48)
[ 4.296155] r7:00000000 r6:c019e41c r5:c0c44408 r4:c0489c84
[ 4.303042] [<c019e41c>] (__device_attach+0x0/0x48) from [<c019cb14>] (bus_for_each_drv+0x58/0x94)
[ 4.313091] r5:c1a15e30 r4:c0c44408
[ 4.317443] [<c019cabc>] (bus_for_each_drv+0x0/0x94) from [<c019e148>] (device_attach+0x7c/0xa8)
[ 4.327295] r7:00000000 r6:c0c44408 r5:c0c4443c r4:c0c44408
[ 4.334173] [<c019e0cc>] (device_attach+0x0/0xa8) from [<c019d73c>] (bus_probe_device+0x30/0xa0)
[ 4.344113] r6:c0c44408 r5:c04898b4 r4:c0c44408 r3:00000001
[ 4.350903] [<c019d70c>] (bus_probe_device+0x0/0xa0) from [<c019bf00>] (device_add+0x470/0x614)
[ 4.360749] r6:00000000 r5:c0e23980 r4:c0c44408 r3:00000031
[ 4.367529] [<c019ba90>] (device_add+0x0/0x614) from [<c025220c>] (mmc_add_card+0x17c/0x1d8)
[ 4.377007] [<c0252090>] (mmc_add_card+0x0/0x1d8) from [<c02564c8>] (mmc_attach_sd+0x180/0x204)
[ 4.386848] r6:c0339194 r5:00000000 r4:c1ab0800
[ 4.392379] [<c0256348>] (mmc_attach_sd+0x0/0x204) from [<c0251a5c>] (mmc_rescan+0x200/0x29c)
[ 4.402025] r5:c1ab0800 r4:c1ab09cc
[ 4.406302] [<c025185c>] (mmc_rescan+0x0/0x29c) from [<c004238c>] (process_one_work+0x1e0/0x338)
[ 4.416153] r7:00000000 r6:c025185c r5:c18d3800 r4:c19b6ac0
[ 4.423034] [<c00421ac>] (process_one_work+0x0/0x338) from [<c004316c>] (worker_thread+0x1c0/0x2c8)
[ 4.433274] [<c0042fac>] (worker_thread+0x0/0x2c8) from [<c0046a1c>] (kthread+0x94/0xa0)
[ 4.442369] [<c0046988>] (kthread+0x0/0xa0) from [<c0031d20>] (do_exit+0x0/0x660)
[ 4.450866] r6:c0031d20 r5:c0046988 r4:c1833ed8从上面可以看出：mmc_bus_probe ->mmc_blk_probe->add_disk，就是具体实现分区的地方了。
知道哪些函数了，剩下的找到对应C文件。在drivers/mmc/card/block.c中找到了这些相关的函数：
mmc_blk_probe，add_disk，其中，“mmcblk0: mmc0:d555 SD04G 3.79 GiB ”就是mmc_blk_probe中的
printk(KERN_INFO "%s: %s %s %s %s\n",
md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
cap_str, md->read_only ? "(ro)" : "");
打印的。
找到这里，要做的事情，其实才刚开始，但是也是只是时间问题了。因为我之前自己做了LBA的块设备，所以，知道怎么添加多分区。此处，只是要添加一些代码即可。
【具体代码】
在drivers/mmc/card/block.c添加如下代码：
#define AS353X_MMC_SUPPORT_MULTI_PART 1
#if AS353X_MMC_SUPPORT_MULTI_PART
typedef struct
{
int32_t start_sec;
int32_t sec_num;
}as353x_blk_part_info;
/*
PatitionName FsType PartitionSize Rage(From-To)
(1)uImage None (4M) 0 - (4M)
(2)Rootfs FAT/Ext2 (28M or 124M) (4M) - (32M or 128M)
(3)Data Ext2/Ext3 (CardSize -496KB - (28M or 124M)) (32M or 128M) - (CardSize -496KB)
(4)uboot None (496KB) (CardSize -496KB) - (CardSize )
A.not support multi partitions for <=32MB, it is too small for rootfs+uImage+uboot
B.for rootfs, if mmc/sd size > 128MB, reserved 128MB, or reserved 32MB
C.for uboot, 496KB = 0x7C000, which if fixed by BootCode
*/
#ifndef SZ_1M
#define SZ_1M 0x00100000
#endif
#ifndef SZ_1K
#define SZ_1K 0x00000400
#endif
#define SDMMC_BLOCK_SIZE 512
#define SDMMC_CARDSIZE_128MB (128 *SZ_1M)
#define SDMMC_CARDSIZE_TOO_SMALL (32 *SZ_1M)
#define SDMMC_ROOTFS_SIZE_128MB (128*SZ_1M) /* actual is 128-4=124MB*/
#define SDMMC_ROOTFS_SIZE_32MB (32*SZ_1M) /* actual is 32-4= 28MB*/
#define SDMMC_KERNEL_SIZE (4*SZ_1M)
#define SDMMC_UBOOT_SIZE (496*SZ_1K) /* 0x7C000=496KB */
#define SDMMC_ROOTFS_128MB_BLK_NUM (SDMMC_ROOTFS_SIZE_128MB/SDMMC_BLOCK_SIZE)
#define SDMMC_ROOTFS_32MB_BLK_NUM (SDMMC_ROOTFS_SIZE_32MB/SDMMC_BLOCK_SIZE)
#define SDMMC_KERNEL_BLK_NUM (SDMMC_KERNEL_SIZE/SDMMC_BLOCK_SIZE)
#define SDMMC_UBOOT_BLK_NUM (SDMMC_UBOOT_SIZE/SDMMC_BLOCK_SIZE)
/* 0 is the first partion for whole disk */
#define AS353X_SDMMC_MAX_PARTITIONS 5
static as353x_blk_part_info as353x_mmc_partitions[AS353X_SDMMC_MAX_PARTITIONS];
/* 1 block=512B */
static int as353x_init_sdmmc_parition(uint32_t card_size_in_blocks)
{
uint32_t rootfs_blocks;
uint64_t card_size_bytes = card_size_in_blocks * SDMMC_BLOCK_SIZE;
if(card_size_bytes <= SDMMC_CARDSIZE_TOO_SMALL)
return -1; /* not support multi partitions here */
/* 0 is for whole disk, not used here */
as353x_mmc_partitions[0].start_sec = 0;
as353x_mmc_partitions[0].sec_num =0;
if(card_size_bytes > SDMMC_CARDSIZE_128MB)
{
/* > 128MB, is 128MB */
rootfs_blocks = SDMMC_ROOTFS_128MB_BLK_NUM;
}
else
{
/* <=128MB is 32MB */
rootfs_blocks = SDMMC_ROOTFS_32MB_BLK_NUM;
}
/* 4M uImage */
as353x_mmc_partitions[1].start_sec = 0;
as353x_mmc_partitions[1].sec_num =SDMMC_KERNEL_BLK_NUM;
/* 28 or 124 MB rootfs */
as353x_mmc_partitions[2].start_sec = SDMMC_KERNEL_BLK_NUM;
as353x_mmc_partitions[2].sec_num = rootfs_blocks - SDMMC_KERNEL_BLK_NUM;
/* carsize - 496KB- (28 or 124) MB */
as353x_mmc_partitions[3].start_sec = rootfs_blocks;
as353x_mmc_partitions[3].sec_num = card_size_in_blocks - rootfs_blocks - SDMMC_UBOOT_BLK_NUM;
/* 496KB uboot */
as353x_mmc_partitions[4].start_sec = card_size_in_blocks - SDMMC_UBOOT_BLK_NUM;
as353x_mmc_partitions[4].sec_num = SDMMC_UBOOT_BLK_NUM;
return 0;
}
#endif
static int mmc_blk_probe(struct mmc_card *card)
{
。。。。。
char cap_str[10];
#if AS353X_MMC_SUPPORT_MULTI_PART
int i;
struct hd_struct * hd;
#endif
/*
* Check that the card supports the command class(es) we need.
*/
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
return -ENODEV;
。。。。。。
mmc_set_drvdata(card, md);
add_disk(md->disk);
#if AS353X_MMC_SUPPORT_MULTI_PART
if(0==as353x_init_sdmmc_parition(get_capacity(md->disk)))
{
for(i = 1; i < AS353X_SDMMC_MAX_PARTITIONS; i++)
{
hd = add_partition(md->disk, i,as353x_mmc_partitions[i].start_sec, as353x_mmc_partitions[i].sec_num, ADDPART_FLAG_NONE);
}
}
#endif
return 0;
。。。。
}
【总结】
1.还是应了那句话，只要有源码，就不怕解决不了问题。
2.调试的时候，很多时候是看起来没有办法了，但是只要细心，额外看到的信息，可以充分利用，比如上面的dev->kobj有个name参数，就可以拿来打印出来看看到底是哪些名字，以便可能继续提供更多的信息，便于找到新的办法或线索。
3.做事情，还是要有耐力和找到有效的办法，没有办法，也要尽可能地想办法。如果具备了一定的基础知识，加上细心观察，充分利用信息，很多时候，即使没有办法了，也可能会“船到桥头自然直”，自然找到进一步前进的到道路的。