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buspirate: Add psus option

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This change adds a 'psus=<on|off>' option, to control the external Vcc
state of the bus pirate, allowing hardware where the SPI flash chip is
powered by the 3V3/5V lines directly.

Change-Id: I8a7d4b40c0f7f04f6976f6757f05b61f2c9958f9
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/54887
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Jeremy Kerr 2021-05-23 17:58:06 +08:00 committed by Nico Huber
parent bc31bd027d
commit f9f9c9d2c6
2 changed files with 31 additions and 1 deletions
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16
buspirate_spi.c
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@ -326,6 +326,7 @@ static int buspirate_spi_init(void)
int serialspeed_index = -1;
int ret = 0;
int pullup = 0;
int psu = 0;
unsigned char *bp_commbuf;
int bp_commbufsize;
@ -377,6 +378,17 @@ static int buspirate_spi_init(void)
}
free(tmp);
tmp = extract_programmer_param("psus");
if (tmp) {
if (strcasecmp("on", tmp) == 0)
psu = 1;
else if (strcasecmp("off", tmp) == 0)
; // ignore
else
msg_perr("Invalid psus state, not enabling.\n");
}
free(tmp);
/* Default buffer size is 19: 16 bytes data, 3 bytes control. */
#define DEFAULT_BUFSIZE (16 + 3)
bp_commbuf = malloc(DEFAULT_BUFSIZE);
@ -638,6 +650,10 @@ static int buspirate_spi_init(void)
bp_commbuf[0] |= (1 << 2);
msg_pdbg("Enabling pull-up resistors.\n");
}
if (psu == 1) {
bp_commbuf[0] |= (1 << 3);
msg_pdbg("Enabling PSUs.\n");
}
ret = buspirate_sendrecv(bp_commbuf, 1, 1);
if (ret) {
ret = 1;

16
flashrom.8.tmpl
View File

@ -952,7 +952,21 @@ can be
More information about the Bus Pirate pull-up resistors and their purpose is available
.URLB "http://dangerousprototypes.com/docs/Practical_guide_to_Bus_Pirate_pull-up_resistors" \
"in a guide by dangerousprototypes" .
Only the external supply voltage (Vpu) is supported as of this writing.
.sp
The state of the Bus Pirate power supply pins is controllable through an optional
.B psus
parameter. Syntax is
.sp
.B " flashrom -p buspirate_spi:psus=state"
.sp
where
.B state
can be
.BR on " or " off .
This allows the bus pirate to power the ROM chip directly. This may also be used to provide the
required pullup voltage (when using the
.B pullups
option), by connecting the Bus Pirate's Vpu input to the appropriate Vcc pin.
.SS
.BR "pickit2_spi " programmer
.IP