diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/mysteries_intel.txt | 18 | ||||
| -rw-r--r-- | Documentation/serprog-protocol.txt | 109 |
2 files changed, 127 insertions, 0 deletions
diff --git a/Documentation/mysteries_intel.txt b/Documentation/mysteries_intel.txt new file mode 100644 index 0000000..d6d3dfb --- /dev/null +++ b/Documentation/mysteries_intel.txt @@ -0,0 +1,18 @@ += BBAR on ICH8 = + There is no sign of BBAR (BIOS Base Address Configuration Register) in the + public datasheet (or specification update) of the ICH8. Also, the offset of + that register has changed between ICH7 (SPIBAR + 50h) and ICH9 (SPIBAR + + A0h), so we have no clue if or where it is on ICH8. Out current policy is to + not touch it at all and assume/hope it is 0. + += Accesses beyond region bounds in descriptor mode = + Intel's flash image tool will always expand the last region so that it covers + the whole flash chip, but some boards ship with a different configuration. + It seems that in descriptor mode all addresses outside the used regions can not + be accessed whatsoever. This is not specified anywhere publicly as far as we + could tell. flashrom does not handle this explicitly yet. It will just fail + when trying to touch an address outside of any region. + See also http://www.flashrom.org/pipermail/flashrom/2011-August/007606.html + += Unlocking the ME region = +TODO diff --git a/Documentation/serprog-protocol.txt b/Documentation/serprog-protocol.txt new file mode 100644 index 0000000..a3a4863 --- /dev/null +++ b/Documentation/serprog-protocol.txt @@ -0,0 +1,109 @@ +Serial Flasher Protocol Specification - version 1 (0x01 return value == 1) + +Command And Answer Sequence - all commands give an answer. +PC: COMMAND(8bit) <parameters determined by opcode> +DEV: ACK/NAK(8bit) <OPTIONAL RETURN BYTES (only if ACK)> / nothing +Command 0x10 (SYNCNOP) has a special return of NAK+ACK for synchronization. + +ACK = 0x06 +NAK = 0x15 + +All multibyte values are little-endian. Addresses and lengths are 24-bit. + +COMMAND Description Parameters Return Value +0x00 NOP none ACK +0x01 Query programmer iface version none ACK + 16bit version (nonzero) +0x02 Query supported commands bitmap none ACK + 32 bytes (256 bits) of supported cmds flags +0x03 Query programmer name none ACK + 16 bytes string (null padding) / NAK +0x04 Query serial buffer size none ACK + 16bit size / NAK +0x05 Query supported bustypes none ACK + 8-bit flags (as per flashrom) / NAK +0x06 Query connected address lines none ACK + 8bit line count / NAK +0x07 Query operation buffer size none ACK + 16bit size / NAK +0x08 Query maximum write-n length none ACK + 24bit length (0==2^24) / NAK +0x09 Read byte 24-bit addr ACK + BYTE / NAK +0x0A Read n bytes 24-bit addr + 24-bit length ACK + length bytes / NAK +0x0B Initialize operation buffer none ACK / NAK +0x0C Write to opbuf: Write byte 24-bit addr + 8-bit byte ACK / NAK (NOTE: takes 5 bytes in opbuf) +0x0D Write to opbuf: Write n 24-bit length + 24-bit addr + ACK / NAK (NOTE: takes 7+n bytes in opbuf) + + length bytes of data +0x0E Write to opbuf: delay 32-bit usecs ACK / NAK (NOTE: takes 5 bytes in opbuf) +0x0F Execute operation buffer none ACK / NAK +0x10 Sync NOP none NAK + ACK (for synchronization) +0x11 Query maximum read-n length none ACK + 24-bit length (0==2^24) / NAK +0x12 Set used bustype 8-bit flags (as with 0x05) ACK / NAK +0x13 Perform SPI operation 24-bit slen + 24-bit rlen ACK + rlen bytes of data / NAK + + slen bytes of data +0x?? unimplemented command - invalid. + + +Additional information of the above commands: + About unimplemented commands / startup sequence: + Only commands allowed to be used without checking anything are 0x00,0x10 and 0x01 (NOP,SYNCNOP,Q_IFACE). + If 0x01 doesn't return 1, dont do anything if you dont support a newer protocol. + Then, check support for any other opcode (except 0x02) by using 0x02 (Q_CMDMAP). + 0x02 (Q_CMDMAP): + The map's bits are mapped as follows: + cmd 0 support: byte 0 bit 0 + cmd 1 support: byte 0 bit 1 + cmd 7 support: byte 0 bit 7 + cmd 8 support: byte 1 bit 0, and so on. + 0x04 (Q_SERBUF): + If the programmer has a guaranteed working flow control, + it should return a big bogus value - eg 0xFFFF. + 0x05 (Q_BUSTYPE): + The bit's are defined as follows: + bit 0: PARALLEL, bit 1: LPC, bit 2: FWH, bit 3: SPI. + 0x06 (Q_CHIPSIZE): + Only applicable to parallel programmers. + An LPC/FWH/SPI-programmer can report this as not supported in the command bitmap. + 0x08 (Q_WRNMAXLEN): + If a programmer reports a bigger maximum write-n length than the serial buffer size, + it is assumed that the programmer can process the data fast enough to take in the + reported maximum write-n without problems. + 0x0F (O_EXEC): + Execute operation buffer will also clear it, regardless of the return value. + 0x11 (Q_RDNMAXLEN): + If this command is not supported, assume return of 0 (2^24). + 0x12 (S_BUSTYPE): + Set's the used bustype if the programmer can support more than one flash protocol. + Sending a byte with more than 1 bit set will make the programmer decide among them + on it's own. Bit values as with Q_BUSTYPE. + 0x13 (O_SPIOP): + Send and receive bytes via SPI. + Maximum slen is Q_WRNMAXLEN in case Q_BUSTYPE returns SPI only or S_BUSTYPE was used + to set SPI exclusively before. Same for rlen and Q_RDNMAXLEN. + This operation is immediate, meaning it doesnt use the operation buffer. + 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. + Support for the following commands is necessary for flashrom to operate properly: + S_CMD_Q_SERBUF, S_CMD_Q_OPBUF, S_CMD_Q_WRNMAXLEN, S_CMD_R_BYTE, + S_CMD_R_NBYTES, S_CMD_O_INIT, S_CMD_O_WRITEB, S_CMD_O_WRITEN, + S_CMD_O_DELAY, S_CMD_O_EXEC. + In addition, support for these commands is recommended: + S_CMD_Q_PGMNAME, S_CMD_Q_BUSTYPE, S_CMD_Q_CHIPSIZE (if parallel). + + +This define listing should help C coders - (it's here to be the single source for copying - will be a .h someday i think) +#define S_ACK 0x06 +#define S_NAK 0x15 +#define S_CMD_NOP 0x00 /* No operation */ +#define S_CMD_Q_IFACE 0x01 /* Query interface version */ +#define S_CMD_Q_CMDMAP 0x02 /* Query supported commands bitmap */ +#define S_CMD_Q_PGMNAME 0x03 /* Query programmer name */ +#define S_CMD_Q_SERBUF 0x04 /* Query Serial Buffer Size */ +#define S_CMD_Q_BUSTYPE 0x05 /* Query supported bustypes */ +#define S_CMD_Q_CHIPSIZE 0x06 /* Query supported chipsize (2^n format) */ +#define S_CMD_Q_OPBUF 0x07 /* Query operation buffer size */ +#define S_CMD_Q_WRNMAXLEN 0x08 /* Query Write to opbuf: Write-N maximum length */ +#define S_CMD_R_BYTE 0x09 /* Read a single byte */ +#define S_CMD_R_NBYTES 0x0A /* Read n bytes */ +#define S_CMD_O_INIT 0x0B /* Initialize operation buffer */ +#define S_CMD_O_WRITEB 0x0C /* Write opbuf: Write byte with address */ +#define S_CMD_O_WRITEN 0x0D /* Write to opbuf: Write-N */ +#define S_CMD_O_DELAY 0x0E /* Write opbuf: udelay */ +#define S_CMD_O_EXEC 0x0F /* Execute operation buffer */ +#define S_CMD_SYNCNOP 0x10 /* Special no-operation that returns NAK+ACK */ +#define S_CMD_Q_RDNMAXLEN 0x11 /* Query read-n maximum length */ +#define S_CMD_S_BUSTYPE 0x12 /* Set used bustype(s). */ +#define S_CMD_O_SPIOP 0x13 /* Perform SPI operation. */ |
