59e12a4a8c
Rather than using CMD_JFFS2 for both the filesystem and its command, we should have a separate option for each. This allows us to enable JFFS2 support without the command, if desired, which reduces U-Boot's size slightly. Signed-off-by: Simon Glass <sjg@chromium.org>
41 lines
1.5 KiB
Plaintext
41 lines
1.5 KiB
Plaintext
JFFS2 options and usage.
|
|
-----------------------
|
|
|
|
JFFS2 in U-Boot is a read only implementation of the file system in
|
|
Linux with the same name. To use JFFS2 define CONFIG_CMD_JFFS2.
|
|
|
|
The module adds three new commands.
|
|
fsload - load binary file from a file system image
|
|
fsinfo - print information about file systems
|
|
ls - list files in a directory
|
|
chpart - change active partition
|
|
|
|
If you do now need the commands, you can enable the filesystem separately
|
|
with CONFIG_FS_JFFS2 and call the jffs2 functions yourself.
|
|
|
|
If you boot from a partition which is mounted writable, and you
|
|
update your boot environment by replacing single files on that
|
|
partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS. Scanning
|
|
the JFFS2 filesystem takes *much* longer with this feature, though.
|
|
Sorting is done while inserting into the fragment list, which is
|
|
more or less a bubble sort. That algorithm is known to be O(n^2),
|
|
thus you should really consider if you can avoid it!
|
|
|
|
|
|
There only one way for JFFS2 to find the disk. It uses the flash_info
|
|
structure to find the start of a JFFS2 disk (called partition in the code)
|
|
and you can change where the partition is with two defines.
|
|
|
|
CONFIG_SYS_JFFS2_FIRST_BANK
|
|
defined the first flash bank to use
|
|
|
|
CONFIG_SYS_JFFS2_FIRST_SECTOR
|
|
defines the first sector to use
|
|
---
|
|
|
|
TODO.
|
|
|
|
Remove the assumption that JFFS can dereference a pointer
|
|
into the disk. The current code do not work with memory holes
|
|
or hardware with a sliding window (PCMCIA).
|