Hello Lukasz,
Am 31.10.2013 18:25, schrieb Lukasz Majewski:
Dear All,
As a follow up from u-boot's mini-summit at ELCE 2013, I would like to once again share the new format of dfu_alt_info env variable (for those who couldn't attend).
dfu_alt_info_cleanup:
|---+-------------+-------------+---------+----------------------| | |<dev_name>: |<alt_name>, |<type> | extra params | |---+-------------+-------------+---------+----------------------| | 1 | mmc0: | rootfs, | part; | - | | 2 | mmc0: | uImage, | file, | part, dir; | | 3 | nand0: | u-boot.bin, | raw, | start, size; |
One more usecase for nand (just for documentation):
| 4 | nand0: | u-boot | part, | - |
Here is "alt_name" == "mtd partition name" -> start, size from mtd info
| 4 | mmc0: | u-boot.bin, | raw, | start_lba, size_lba; | | 5 | ram0: | uImage, | ram, | start, size; | | 6 | ubi0: | kernel0, | raw; | - |
There are 2 usecases with ubi (Please correct me, if I am wrong):
a) update a complete ubi device:
| 6 | ubi0: | kernel, | part | - | | 7 | ubi0: | kernel, | raw | start, size |
with them, we can update a complete "ubi device" with n ubi volumes in it (This is currently used on the am335x based siemens boards).
I am not sure if ubi is more a "device" or more a "type". But as ubi can be used also on nor flash, I think in the meantime, it is more a device than a type in the sight of dfu ... but I vary here in my opinion...
This usecase is currently implemented for nand, and same code is used as for "raw" or "part" nand usecases, just in the ubi case a flag is set, which does:
- erase nand sectors with WITH_DROP_FFS - erase spare sectors at the end of the area
b) update single ubi volume.
We need this infos for updating a ubi volume
- ubi device name = mtd partition name - vid header offset - ubi volume name - ubi volume size - ubi volume type
- steps for updating a ubi volume - attach to an ubi device "ubi part device_name vid_header_offset" - if volume_name !exist, create it "ubi create volume_name size type" - write ubi volume "ubi write img_addr volume_name size"
| 8 | ubi0: | data, | volume | vid_off, vol_nam, vol_sz, vol_type | ^ device name You see, the list gets long ... or maybe we can cover this usecase with dfu command?
bye, Heiko