MBR: one more comment

Comments are good...

diff --git a/mbr/mbr.S b/mbr/mbr.S
index 424c46d..d2e7d0f 100644 (file)
--- a/mbr/mbr.S
+++ b/mbr/mbr.S
@@ -128,6 +128,7 @@ read_sector:
 
        /* This chunk is skipped if we have ebios */
        /* Do not clobber %eax before this chunk! */
+       /* This also relies on %bx and %edx as set up above. */
 read_sector_cbios:
        divl    (secpercyl)
        shlb    $6, %ah