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| author | Hans de Goede <hdegoede@redhat.com> | 2012-09-18 09:48:08 +0000 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2012-09-18 09:48:08 +0000 |
| commit | ba42e0394b6ee232ea3e8414a219437ecc377948 (patch) | |
| tree | ae2cd3f0081a209c90975d62cb472cc63efbd955 | |
| parent | fb9f83e81456659e4c423d5ef705dd0b93fc7bd4 (diff) | |
| download | libgphoto2-ba42e0394b6ee232ea3e8414a219437ecc377948.tar.gz | |
Document ax206 checksum command
git-svn-id: https://svn.code.sf.net/p/gphoto/code/branches/libgphoto2-2_4/libgphoto2@14104 67ed7778-7388-44ab-90cf-0a291f65f57c
| -rw-r--r-- | camlibs/ax203/README.ax203 | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/camlibs/ax203/README.ax203 b/camlibs/ax203/README.ax203 index 75ab86538..05a50a872 100644 --- a/camlibs/ax203/README.ax203 +++ b/camlibs/ax203/README.ax203 @@ -113,6 +113,24 @@ because it contains a ton of JPEG metadata from photoshop, if this were to be removed, a lot more of the memory could be used to actually store pictures. +ax206 checksum command +---------------------- + +While working on support for the ax206's not quite raw flash access mode +for eeproms with AAI, like the SST25VF080, I found out that at least the +ax206 also has a command to read part of the eeprom and generate a 16 bit +checksum for it. The layout of the scsi cmd buffer for this is as follows: +byte 0: 0xcd (read from dev) +byte 1 - 4: 0 +byte 5: 5 +byte 6: 5 +byte 7 - 8: size of area to checksum, byte 7 == MSB, 0 means 65536 +byte 9 - 10: 0 +byte 11 - 13: address to start checksum, byte 7 == MSB + +And then readback 64 bytes of scsi data, where the first 2 are the 16 bit +checksum of all the bytes in the area with byte 0 being the MSB. + Hans de Goede <hdegoede@redhat.com> -3 May 2010 +16 Sep 2012 |