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author | wdenk <wdenk> | 2002-11-03 00:24:07 +0000 |
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committer | wdenk <wdenk> | 2002-11-03 00:24:07 +0000 |
commit | c609719b8d1b2dca590e0ed499016d041203e403 (patch) | |
tree | 7ea1755d80903ff972f312a249eb856061d40e15 /doc/README.JFFS2 | |
parent | 5b1d713721c3ea02549940133f09236783dda1f9 (diff) | |
download | u-boot-imx-c609719b8d1b2dca590e0ed499016d041203e403.zip u-boot-imx-c609719b8d1b2dca590e0ed499016d041203e403.tar.gz u-boot-imx-c609719b8d1b2dca590e0ed499016d041203e403.tar.bz2 |
Initial revision
Diffstat (limited to 'doc/README.JFFS2')
-rw-r--r-- | doc/README.JFFS2 | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/doc/README.JFFS2 b/doc/README.JFFS2 new file mode 100644 index 0000000..0d39c46 --- /dev/null +++ b/doc/README.JFFS2 @@ -0,0 +1,68 @@ +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 CFG_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 + + +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. + +CFG_JFFS2_FIRST_BANK + defined the first flash bank to use + +CFG_JFFS2_FIRST_SECTOR + defines the first sector to use + + +The second way is to define CFG_JFFS_CUSTOM_PART and implement the +jffs2_part_info(int part_num) function in your board specific files. +In this mode CFG_JFFS2_FIRST_BANK and CFG_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 CFG_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. + + Add a new command so it's actually possible to change + partition. + + 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). |