75 lines
2.1 KiB
Plaintext
75 lines
2.1 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 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 is two ways for JFFS2 to find the disk. The default way 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
|
|
|
|
|
|
The second way is to define CONFIG_SYS_JFFS_CUSTOM_PART and implement the
|
|
jffs2_part_info(int part_num) function in your board specific files.
|
|
In this mode CONFIG_SYS_JFFS2_FIRST_BANK and CONFIG_SYS_JFFS2_FIRST_SECTOR is not
|
|
used.
|
|
|
|
The input is a partition number starting with 0.
|
|
Return a pointer to struct part_info or NULL for error;
|
|
|
|
Ex jffs2_part_info() for one partition.
|
|
---
|
|
#if defined CONFIG_SYS_JFFS_CUSTOM_PART
|
|
#include <jffs2/jffs2.h>
|
|
|
|
static struct part_info part;
|
|
|
|
struct part_info*
|
|
jffs2_part_info(int part_num)
|
|
{
|
|
if(part_num==0){
|
|
if(part.usr_priv==(void*)1)
|
|
return ∂
|
|
|
|
memset(&part, 0, sizeof(part));
|
|
part.offset=(char*)0xFF800000;
|
|
part.size=1024*1024*8;
|
|
|
|
/* Mark the struct as ready */
|
|
part.usr_priv=(void*)1;
|
|
|
|
return ∂
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
---
|
|
|
|
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).
|