[coreboot] [flashrom] [PATCH] external serial flasher protocol support
Urja Rannikko
urjaman at gmail.com
Wed Jun 10 00:11:10 CEST 2009
Support for an external serial flasher protocol.
Supports RS-232, USB serial converters (untested) and TCP streams.
Signed-off-by: Urja Rannikko <urjaman at gmail.com>
---
Please commit my jedec.c readb to readn patch (or carldani's version
that i've only heard of in IRC) before this
- they're not dependent but without that patch this protocol is awfully slow.
Also attached is a simple specification of the protocol this code
implements, it hasnt changed much from my last mail,
but i attach it here so it's readily available in the same mail with
the implementation.
I also have the implementation of this protocol on the device side for
an Atmel AVR ATmega168 microcontroller, it is
also included just for an idea of how i implemented the device side
parser - it has GPL headers added to all files and COPYING
included to make it GPLv2+ for real, but has not otherwise been looked
at for release - the device it runs on is in a way very special,
so i think compiling that directly would be of little use to anyone atm.
--
urjaman
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Serial Flasher Protocol Specification - version 1 (0x01 return value == 1)
Command And Answer Sequence - not all commands give an answer
PC: COMMAND(8bit) <parameters determined by opcode>
DEV: ACK/NAK(8bit) <OPTIONAL RETURN BYTES (only if ACK)> or nothing
ACK = 0x10
NAK = 0xBA
All multibyte values are little-endian.
COMMAND Description Parameters Return Value
0x00 NOP (to synchronize) none NAK + ACK (a special sequence for easier sync)
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
eg. 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
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
bit 0: PARALLEL
bit 1: LPC
bit 2: FWH
bit 3: SPI if ever supported
0x06 Query supported chip size none ACK + 8bit power of two / NAK
0x07 Query operation buffer size none ACK + 16bit size / NAK
0x08 Query write-n maximum data len none ACK + 24bit maximum length / NAK
0x00 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 6 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
- Execute operation buffer will also clear it, regardless of the return value
0x?? unimplemented command - dont do, dangerous, check for support with 0x02 before using any opcode exept 0x00, 0x01 and 0x02.
if 0x01 doesn't return 1, dont do anything if you dont support a newer protocol.
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 0x10
#define S_NAK 0xBA
#define S_CMD_SYNCNOP 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 lenght */
#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 */
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