projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| c609719b WD |
1 | JFFS2 options and usage. |
| 2 | ----------------------- | |
| 3 | ||
| 4 | JFFS2 in U-Boot is a read only implementation of the file system in | |
| 5 | Linux with the same name. To use JFFS2 define CFG_CMD_JFFS2. | |
| 6 | ||
| 7 | The module adds three new commands. | |
| 8 | fsload - load binary file from a file system image | |
| 9 | fsinfo - print information about file systems | |
| 10 | ls - list files in a directory | |
| 11 | ||
| 06d01dbe WD |
12 | If you boot from a partition which is mounted writable, and you |
| 13 | update your boot environment by replacing single files on that | |
| 14 | partition, you should also define CFG_JFFS2_SORT_FRAGMENTS. Scanning | |
| 15 | the JFFS2 filesystem takes *much* longer with this feature, though. | |
| 16 | Sorting is done while inserting into the fragment list, which is | |
| 17 | more or less a bubble sort. That algorithm is known to be O(n^2), | |
| 18 | thus you should really consider if you can avoid it! | |
| 19 | ||
| c609719b WD |
20 | |
| 21 | There is two ways for JFFS2 to find the disk. The default way uses | |
| 22 | the flash_info structure to find the start of a JFFS2 disk (called | |
| 23 | partition in the code) and you can change where the partition is with | |
| 24 | two defines. | |
| 25 | ||
| 26 | CFG_JFFS2_FIRST_BANK | |
| 27 | defined the first flash bank to use | |
| 28 | ||
| 29 | CFG_JFFS2_FIRST_SECTOR | |
| 30 | defines the first sector to use | |
| 31 | ||
| 32 | ||
| 33 | The second way is to define CFG_JFFS_CUSTOM_PART and implement the | |
| 34 | jffs2_part_info(int part_num) function in your board specific files. | |
| 35 | In this mode CFG_JFFS2_FIRST_BANK and CFG_JFFS2_FIRST_SECTOR is not | |
| 36 | used. | |
| 37 | ||
| 38 | The input is a partition number starting with 0. | |
| 39 | Return a pointer to struct part_info or NULL for error; | |
| 40 | ||
| 41 | Ex jffs2_part_info() for one partition. | |
| 42 | --- | |
| 43 | #if defined CFG_JFFS_CUSTOM_PART | |
| 44 | #include <jffs2/jffs2.h> | |
| 45 | ||
| 46 | static struct part_info part; | |
| 47 | ||
| 48 | struct part_info* | |
| 49 | jffs2_part_info(int part_num) | |
| 50 | { | |
| 51 | if(part_num==0){ | |
| 52 | if(part.usr_priv==(void*)1) | |
| 53 | return ∂ | |
| 54 | ||
| 55 | memset(&part, 0, sizeof(part)); | |
| 56 | part.offset=(char*)0xFF800000; | |
| 57 | part.size=1024*1024*8; | |
| 58 | ||
| 59 | /* Mark the struct as ready */ | |
| 60 | part.usr_priv=(void*)1; | |
| 61 | ||
| 62 | return ∂ | |
| 63 | } | |
| 64 | return 0; | |
| 65 | } | |
| 66 | #endif | |
| 67 | --- | |
| 68 | ||
| 69 | TODO. | |
| 70 | ||
| 8bde7f77 | 71 | Add a new command so it's actually possible to change |
| c609719b WD |
72 | partition. |
| 73 | ||
| 8bde7f77 WD |
74 | Remove the assumption that JFFS can dereference a pointer |
| 75 | into the disk. The current code do not work with memory holes | |
| 76 | or hardware with a sliding window (PCMCIA). |