ChangeSet 1.1557.49.31, 2004/02/19 15:42:36-08:00, [EMAIL PROTECTED]
[PATCH] USB: add comments to sddr09.c
People ask how to write the CIS on a SmartMedia card using an sddr09
reader/writer. The patch below documents the required command (but does
not add the code).
Two years ago or so I used this to fix the CIS on a card that my camera no
longer wanted to accept. A Linux utility to do this might be useful, but
the problem always is that we do not really have a good mechanism.
How does one tell a driver that it has to do something special? Add yet
another ioctl?
drivers/usb/storage/sddr09.c | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+)
diff -Nru a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c
--- a/drivers/usb/storage/sddr09.c Thu Feb 19 17:20:32 2004
+++ b/drivers/usb/storage/sddr09.c Thu Feb 19 17:20:32 2004
@@ -27,6 +27,20 @@
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+/*
+ * Known vendor commands: 12 bytes, first byte is opcode
+ *
+ * E7: read scatter gather
+ * E8: read
+ * E9: write
+ * EA: erase
+ * EB: reset
+ * EC: read status
+ * ED: read ID
+ * EE: write CIS (?)
+ * EF: compute checksum (?)
+ */
+
#include "transport.h"
#include "protocol.h"
#include "usb.h"
@@ -461,6 +475,7 @@
*
* Always precisely one block is erased; bytes 2-5 and 10-11 are ignored.
* The byte address being erased is 2*Eaddress.
+ * The CIS cannot be erased.
*/
static int
sddr09_erase(struct us_data *us, unsigned long Eaddress) {
@@ -485,6 +500,20 @@
return result;
}
+
+/*
+ * Write CIS Command: 12 bytes.
+ * byte 0: opcode: EE
+ * bytes 2-5: write address in shorts
+ * bytes 10-11: sector count
+ *
+ * This writes at the indicated address. Don't know how it differs
+ * from E9. Maybe it does not erase? However, it will also write to
+ * the CIS.
+ *
+ * When two such commands on the same page follow each other directly,
+ * the second one is not done.
+ */
/*
* Write Command: 12 bytes.
-------------------------------------------------------
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