From d1be52d545329debd2128c1aa8685b31dfaa0a0e Mon Sep 17 00:00:00 2001 From: Carl-Daniel Hailfinger Date: Sat, 3 Jul 2010 12:14:25 +0000 Subject: Disable writes on default for known bad programmers If a programmer has untested or non-working write/erase code, but probing/reading works, it makes sense to protect the user against write/erase accidents. This feature will be used by the Nvidia MCP SPI code, and it also might make sense for the gfxnvidia driver which has non-working write/erase. Corresponding to flashrom svn r1069. Signed-off-by: Carl-Daniel Hailfinger Acked-by: Michael Karcher --- flashrom.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'flashrom.c') diff --git a/flashrom.c b/flashrom.c index 9f5ab57..090b424 100644 --- a/flashrom.c +++ b/flashrom.c @@ -103,6 +103,9 @@ struct decode_sizes max_rom_decode; /* If nonzero, used as the start address of bottom-aligned flash. */ unsigned long flashbase; +/* Is writing allowed with this programmer? */ +int programmer_may_write; + const struct programmer_entry programmer_table[] = { #if CONFIG_INTERNAL == 1 { @@ -447,6 +450,8 @@ int programmer_init(char *param) flashbase = 0; /* Registering shutdown functions is now allowed. */ may_register_shutdown = 1; + /* Default to allowing writes. Broken programmers set this to 0. */ + programmer_may_write = 1; programmer_param = param; msg_pdbg("Initializing %s programmer\n", @@ -1383,6 +1388,21 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr size = flash->total_size * 1024; buf = (uint8_t *) calloc(size, sizeof(char)); + if (!programmer_may_write && (write_it || erase_it)) { + msg_perr("Write/erase is not working yet on your programmer in " + "its current configuration.\n"); + /* --force is the wrong approach, but it's the best we can do + * until the generic programmer parameter parser is merged. + */ + if (!force) { + msg_perr("Aborting.\n"); + programmer_shutdown(); + return 1; + } else { + msg_cerr("Continuing anyway.\n"); + } + } + if (erase_it) { if (flash->tested & TEST_BAD_ERASE) { msg_cerr("Erase is not working on this chip. "); -- cgit v1.1