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| author | Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at> | 2012-10-27 00:34:23 +0000 |
|---|---|---|
| committer | Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at> | 2012-10-27 00:34:23 +0000 |
| commit | 92fefc921a602acb89a897193c9f31fbb78d85b5 (patch) | |
| tree | abf7f12e3a23e8447c556603dce6de5ed5509e75 /Documentation/serprog-protocol.txt | |
| parent | 0d82e952f2a896aefa1187e53b0ec6d6d559fe9b (diff) | |
| download | ast2050-flashrom-92fefc921a602acb89a897193c9f31fbb78d85b5.zip ast2050-flashrom-92fefc921a602acb89a897193c9f31fbb78d85b5.tar.gz | |
serprog: add opcode to control the programmer's output drivers
This allowed me to let the clips remain attached on my D946GZIS while
playing with coreboot/serialice.
Corresponding to flashrom svn r1618.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Diffstat (limited to 'Documentation/serprog-protocol.txt')
| -rw-r--r-- | Documentation/serprog-protocol.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/serprog-protocol.txt b/Documentation/serprog-protocol.txt index 821cf28..58f4417 100644 --- a/Documentation/serprog-protocol.txt +++ b/Documentation/serprog-protocol.txt @@ -34,6 +34,7 @@ COMMAND Description Parameters Return Value 0x13 Perform SPI operation 24-bit slen + 24-bit rlen ACK + rlen bytes of data / NAK + slen bytes of data 0x14 Set SPI clock frequency in Hz 32-bit requested frequency ACK + 32-bit set frequency / NAK +0x15 Toggle flash chip pin drivers 8-bit (0 disable, else enable) ACK / NAK 0x?? unimplemented command - invalid. @@ -82,6 +83,12 @@ Additional information of the above commands: lower than the one requested. If there is no lower frequency available the lowest possible should be used. The value chosen is sent back in the reply with an ACK. + 0x15 (S_CMD_S_PIN_STATE): + Sets the state of the pin drivers connected to the flash chip. Disabling them allows other + devices (e.g. a mainboard's chipset) to access the chip. This way the serprog controller can + remain attached to the flash chip even when the board is running. The user is responsible to + NOT connect VCC and other permanently externally driven signals to the programmer as needed. + If the value is 0, then the drivers should be disabled, otherwise they should be enabled. About mandatory commands: The only truly mandatory commands for any device are 0x00, 0x01, 0x02 and 0x10, but one can't really do anything with these commands. |
