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Commit | Line | Data |
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c609719b WD |
1 | JFFS2 options and usage. |
2 | ----------------------- | |
3 | ||
4 | JFFS2 in U-Boot is a read only implementation of the file system in | |
b3aff0cb | 5 | Linux with the same name. To use JFFS2 define CONFIG_CMD_JFFS2. |
c609719b WD |
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 | |
f39748ae | 11 | chpart - change active partition |
c609719b | 12 | |
06d01dbe WD |
13 | If you boot from a partition which is mounted writable, and you |
14 | update your boot environment by replacing single files on that | |
6d0f6bcf | 15 | partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS. Scanning |
06d01dbe WD |
16 | the JFFS2 filesystem takes *much* longer with this feature, though. |
17 | Sorting is done while inserting into the fragment list, which is | |
18 | more or less a bubble sort. That algorithm is known to be O(n^2), | |
19 | thus you should really consider if you can avoid it! | |
20 | ||
c609719b | 21 | |
b2482dff SG |
22 | There only one way for JFFS2 to find the disk. It uses the flash_info |
23 | structure to find the start of a JFFS2 disk (called partition in the code) | |
24 | and you can change where the partition is with two defines. | |
c609719b | 25 | |
6d0f6bcf | 26 | CONFIG_SYS_JFFS2_FIRST_BANK |
c609719b WD |
27 | defined the first flash bank to use |
28 | ||
6d0f6bcf | 29 | CONFIG_SYS_JFFS2_FIRST_SECTOR |
c609719b | 30 | defines the first sector to use |
c609719b WD |
31 | --- |
32 | ||
33 | TODO. | |
34 | ||
8bde7f77 WD |
35 | Remove the assumption that JFFS can dereference a pointer |
36 | into the disk. The current code do not work with memory holes | |
37 | or hardware with a sliding window (PCMCIA). |