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From 886f1db7edbfc9ef4c9727b4f564c1e7e35d6565 Mon Sep 17 00:00:00 2001
From: consts <grudnevkv@gmail.com>
Date: Fri, 2 Mar 2018 07:03:37 +0000
Subject: [PATCH] Workaround for MX25 chips
https://notabug.org/libreboot/libreboot/issues/193
---
cli_classic.c | 5 +++++
programmer.h | 1 +
spi.c | 9 +++++++++
3 files changed, 15 insertions(+)
diff --git a/cli_classic.c b/cli_classic.c
index 31f7394..c60168c 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -62,6 +62,7 @@ static void cli_classic_usage(const char *name)
" -o | --output <logfile> log output to <logfile>\n"
" --flash-contents <ref-file> assume flash contents to be <ref-file>\n"
" -L | --list-supported print supported devices\n"
+ " -m | --workaround-mx keep flash busy before sending command\n"
#if CONFIG_PRINT_WIKI == 1
" -z | --list-supported-wiki print supported devices in wiki syntax\n"
#endif
@@ -136,6 +137,7 @@ int main(int argc, char *argv[])
{"help", 0, NULL, 'h'},
{"version", 0, NULL, 'R'},
{"output", 1, NULL, 'o'},
+ {"workaround-mx", 0, NULL, 'm'},
{NULL, 0, NULL, 0},
};
@@ -347,6 +349,9 @@ int main(int argc, char *argv[])
}
#endif /* STANDALONE */
break;
+ case 'm': /* --workaround-mx */
+ workaround_mx = 1;
+ break;
default:
cli_classic_abort_usage();
break;
diff --git a/programmer.h b/programmer.h
index 139f4fa..f54e690 100644
--- a/programmer.h
+++ b/programmer.h
@@ -664,6 +664,7 @@ enum ich_chipset {
CHIPSET_100_SERIES_SUNRISE_POINT, /* also 6th/7th gen Core i/o (LP) variants */
CHIPSET_C620_SERIES_LEWISBURG,
};
+extern int workaround_mx; /* workaround for MX25* chips, makes flash operations more reliable, less failures */
/* ichspi.c */
#if CONFIG_INTERNAL == 1
diff --git a/spi.c b/spi.c
index 56f1fdf..4e61d88 100644
--- a/spi.c
+++ b/spi.c
@@ -30,10 +30,19 @@
#include "programmer.h"
#include "spi.h"
+int workaround_mx; /* Make operations with MX25* chips more reliable */
+
int spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt, const unsigned char *writearr,
unsigned char *readarr)
{
+ if (workaround_mx) {
+ const unsigned char cmd[JEDEC_READ_OUTSIZE] = {JEDEC_READ, 0, 0, 0};
+ unsigned char buf[256];
+ /* keep flash busy for some time, keep CS warm before sending actual command */
+ flash->mst->spi.command(flash, sizeof(cmd), sizeof(buf), cmd, buf);
+ }
+ /* actual command */
return flash->mst->spi.command(flash, writecnt, readcnt, writearr,
readarr);
}
--
1.9.1
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