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util/nvmutil: make 0x3f checksum position a define

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for code clarity

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2025-01-27 04:06:12 +00:00
parent 5ddf7f251d
commit fd1bbdc96c
1 changed files with 8 additions and 5 deletions
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util/nvmutil/nvmutil.c
+8 -5
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@@ -25,7 +25,8 @@ uint8_t hextonum(char chs), rhex(void);
#define COMMAND argv[2] #define COMMAND argv[2]
#define MAC_ADDRESS argv[3] #define MAC_ADDRESS argv[3]
#define PARTN argv[3] #define PARTN argv[3]
#define NVM_CHECKSUM 0xBABA #define NVM_CHECKSUM 0xBABA /* checksum value */
#define NVM_CHECKSUM_WORD 0x3F /* checksum word position */
#define NVM_SIZE 128 /* Area containing NVM words */ #define NVM_SIZE 128 /* Area containing NVM words */
#define SIZE_8KB 0x2000 #define SIZE_8KB 0x2000
@@ -356,10 +357,11 @@ void
cmd_setchecksum(void) cmd_setchecksum(void)
{ {
uint16_t val16 = 0; uint16_t val16 = 0;
for (int c = 0; c < 0x3F; c++) for (int c = 0; c < NVM_CHECKSUM_WORD; c++)
val16 += word(c, part); val16 += word(c, part);
setWord(0x3F, part, NVM_CHECKSUM - val16); /* correct the checksum */ /* correct the checksum */
setWord(NVM_CHECKSUM_WORD, part, NVM_CHECKSUM - val16);
} }
/* intentionally set wrong checksum on part */ /* intentionally set wrong checksum on part */
@@ -367,7 +369,8 @@ void
cmd_brick(void) cmd_brick(void)
{ {
if (goodChecksum(part)) if (goodChecksum(part))
setWord(0x3F, part, ((word(0x3F, part)) ^ 0xFF)); setWord(NVM_CHECKSUM_WORD, part,
((word(NVM_CHECKSUM_WORD, part)) ^ 0xFF));
} }
/* overwrite the contents of one part with the other */ /* overwrite the contents of one part with the other */
@@ -399,7 +402,7 @@ int
goodChecksum(int partnum) goodChecksum(int partnum)
{ {
uint16_t total = 0; uint16_t total = 0;
for(int w = 0; w <= 0x3F; w++) for(int w = 0; w <= NVM_CHECKSUM_WORD; w++)
total += word(w, partnum); total += word(w, partnum);
if (total == NVM_CHECKSUM) if (total == NVM_CHECKSUM)