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util/nvmutil: made a comment a bit clearer

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Signed-off-by: Leah Rowe <leah@libreboot.org>
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Leah Rowe
2026-03-06 19:21:02 +00:00
parent 72caa5f892
commit 1131240d02
1 changed files with 8 additions and 5 deletions
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util/nvmutil/nvmutil.c
+8 -5
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@@ -449,11 +449,14 @@ set_mac_nib(int mac_pos, int nib)
h = (h & 0xE) | 2; /* local, unicast */
/*
* The word is stored big-endian in the file.
* Logically in C, it is stored little-endian,
* because of how we load in read_gbe(), so
* we store the MAC address in reverse order
* per 2-byte word (there are 3 of these).
* Words other than the MAC address are stored little
* endian in the file, and we handle that when reading.
* However, MAC address words are stored big-endian
* in that file, so we write each 2-byte word logically
* in little-endian order, which on little-endian would
* be stored big-endian in memory, and vice versa.
*
* Later code using the MAC string will handle this.
*/
shift = (byte & 1) << 3; /* left or right byte? */
shift |= (nib ^ 1) << 2; /* left or right nib? */