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| author | Maxime Vincent <maxime.vince@gmail.com> | 2017-11-24 13:04:08 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2018-05-11 16:15:19 +0000 |
| commit | 2099c648b929cd36c500202089ef4b7a8c14680f (patch) | |
| tree | d934dc4be97cd3e0e97b948f66463142c598b8cd /buspirate_spi.c | |
| parent | 256835787229205b6522a3c12322b22303bb4152 (diff) | |
| download | flashrom-2099c648b929cd36c500202089ef4b7a8c14680f.tar.gz flashrom-2099c648b929cd36c500202089ef4b7a8c14680f.tar.bz2 flashrom-2099c648b929cd36c500202089ef4b7a8c14680f.zip | |
buspirate_spi: Tristate IOs when using using pullup=on
Avoid putting 3.3V on IO pins when pullup=on to avoid damage to 1.8V
chips.
Signed-off-by: David Hendricks <david.hendricks@gmail.com>
Change-Id: I9ac4c6b7a0079bb1022f2d70030a6eb29996108f
Reviewed-on: https://review.coreboot.org/23864
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'buspirate_spi.c')
| -rw-r--r-- | buspirate_spi.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/buspirate_spi.c b/buspirate_spi.c index db8b310b5..fad309f96 100644 --- a/buspirate_spi.c +++ b/buspirate_spi.c @@ -543,6 +543,10 @@ int buspirate_spi_init(void) /* Set SPI config: output type, idle, clock edge, sample */ bp_commbuf[0] = 0x80 | 0xa; + if (pullup == 1) { + bp_commbuf[0] &= ~(1 << 3); + msg_pdbg("Pull-ups enabled, so using HiZ pin output! (Open-Drain mode)\n"); + } ret = buspirate_sendrecv(bp_commbuf, 1, 1); if (ret) return 1; |