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Fix off-by-one errors in calculating UFM start page.

This commit is contained in:
William D. Jones 2023-05-05 02:00:35 -04:00
parent d8bc361e7f
commit 5e98333a8d
1 changed files with 11 additions and 7 deletions
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18
src/lattice.cpp
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@ -1294,9 +1294,13 @@ uint16_t Lattice::getUFMStartPageFromJEDEC(JedParser *_jed, int id)
/* In general, Lattice tools try to fill UFM from the highest
page to lowest. JEDEC files will give a starting bit offset. */
uint32_t bit_offset = _jed->offset_for_section(id);
/* Convert to starting page, which seems to be one more than the number
of Configuration Flash pages, based on looking at Diamond-generated
JEDECs. */
/* Convert to starting page, relative to Configuration Flash's page 0.
For 7000 parts only, first UFM page starts 16 bytes (1 page) after
the last Configuration Flash page, based on looking at
Diamond-generated JEDECs.
For all other parts, the first UFM page immediately follows the last
Configuration Flash page. */
uint16_t raw_page_offset = bit_offset / 128;
/* Raw page offsets won't overlap- see Lattice TN-02155, page 49. So we
@ -1308,13 +1312,13 @@ uint16_t Lattice::getUFMStartPageFromJEDEC(JedParser *_jed, int id)
if(raw_page_offset > 9211) {
return raw_page_offset - 9211 - 1; // 7000
} else if(raw_page_offset > 5758) {
return raw_page_offset - 5758 - 1; // 4000, 2000U
return raw_page_offset - 5758; // 4000, 2000U
} else if(raw_page_offset > 3198) {
return raw_page_offset - 3198 - 1; // 2000, 1200U
return raw_page_offset - 3198; // 2000, 1200U
} else if(raw_page_offset > 2175) {
return raw_page_offset - 2175 - 1; // 1200, 640U
return raw_page_offset - 2175; // 1200, 640U
} else if(raw_page_offset > 1151) {
return raw_page_offset - 1151 - 1; // 640
return raw_page_offset - 1151; // 640
} else {
// 256- We should bail if we get here! No UFM!
return 0xffff;