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util/nvmutil: print expected checksums

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-09 03:51:52 +00:00
parent c27f8b709a
commit 1a60eabcfe
1 changed files with 23 additions and 12 deletions
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util/nvmutil/nvmutil.c
+23 -12
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@@ -9,6 +9,7 @@
#include <errno.h> #include <errno.h>
#include <fcntl.h> #include <fcntl.h>
#include <inttypes.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
@@ -88,6 +89,7 @@ static void hexdump(size_t partnum);
static void write_gbe_file(void); static void write_gbe_file(void);
static void override_part_modified(void); static void override_part_modified(void);
static void set_checksum(size_t part); static void set_checksum(size_t part);
static uint16_t calculated_checksum(size_t p);
static uint16_t nvm_word(size_t pos16, size_t part); static uint16_t nvm_word(size_t pos16, size_t part);
static void set_nvm_word(size_t pos16, size_t part, uint16_t val16); static void set_nvm_word(size_t pos16, size_t part, uint16_t val16);
static void set_part_modified(size_t p); static void set_part_modified(size_t p);
@@ -739,17 +741,23 @@ read_checksums(void)
static int static int
good_checksum(size_t partnum) good_checksum(size_t partnum)
{ {
size_t w; uint16_t expected_checksum = calculated_checksum(partnum);
uint16_t total = 0; uint16_t current_checksum = nvm_word(NVM_CHECKSUM_WORD, partnum);
for (w = 0; w <= NVM_CHECKSUM_WORD; w++) size_t real_partnum = partnum ^ command[cmd_index].invert;
total += nvm_word(w, partnum);
if (total == NVM_CHECKSUM) if (current_checksum == expected_checksum)
return 1; return 1;
fprintf(stderr, "WARNING: BAD checksum in part %zu\n", fprintf(stderr,
partnum ^ command[cmd_index].invert); "WARNING: BAD checksum in part %zu\n"
"EXPECTED checksum in part %zu: %04x\n"
"CURRENT checksum in part %zu: %04x\n",
real_partnum,
real_partnum,
expected_checksum,
real_partnum,
current_checksum);
set_err(ECANCELED); set_err(ECANCELED);
return 0; return 0;
@@ -1060,17 +1068,20 @@ override_part_modified(void)
static void static void
set_checksum(size_t p) set_checksum(size_t p)
{ {
size_t c;
uint16_t val16;
check_bin(p, "part number"); check_bin(p, "part number");
set_nvm_word(NVM_CHECKSUM_WORD, p, calculated_checksum(p));
}
val16 = 0; static uint16_t
calculated_checksum(size_t p)
{
size_t c;
uint16_t val16 = 0;
for (c = 0; c < NVM_CHECKSUM_WORD; c++) for (c = 0; c < NVM_CHECKSUM_WORD; c++)
val16 += nvm_word(c, p); val16 += nvm_word(c, p);
set_nvm_word(NVM_CHECKSUM_WORD, p, NVM_CHECKSUM - val16); return NVM_CHECKSUM - val16;
} }
/* /*