diff options
Diffstat (limited to 'stm-ice40mkm.c')
| -rw-r--r-- | stm-ice40mkm.c | 52 |
1 files changed, 34 insertions, 18 deletions
diff --git a/stm-ice40mkm.c b/stm-ice40mkm.c index 5a03525..a7eb9a9 100644 --- a/stm-ice40mkm.c +++ b/stm-ice40mkm.c @@ -92,10 +92,10 @@ int ice40mkm_configure(void) size_t c; uint8_t prom_buf[N25Q128_PAGE_SIZE]; uint8_t prom_marker[] = ICE40_MAGIC_MARKER; - int prom_marker_bad = 0, cdone_state; + int prom_marker_bad = 1, cdone_state; - uint32_t prom_addr, prom_offset = N25Q128_SECTOR_SIZE * - (N25Q128_NUM_SECTORS - ICE40_BITSTREAM_SECTORS); + + uint32_t prom_addr, prom_sector_index; uint32_t page, num_pages = ICE40_BITSTREAM_SECTORS * (N25Q128_SECTOR_SIZE / N25Q128_PAGE_SIZE); @@ -124,8 +124,8 @@ int ice40mkm_configure(void) /* * device is now ready to receive the bitstream * - * the bitstream is stored in the last two sectors of the main - * FPGA configuration memory + * the mkm bitmap is stored right after the main bitstream and is aligned + * on sector boundary * * the very first page of the bitstream starts with a magic marker, * which can be used to detect whether the bitstream is present @@ -135,26 +135,44 @@ int ice40mkm_configure(void) fpgacfg_access_control(ALLOW_ARM); /* - * read the bitstream page-by-page and send it over SPI3 + * first read the very first page of each sector to find the offset of + * the mkm bitmap, skip the very first sector (there's no + * sane way for the mkm bitmap may start there) + * + * then read the bitstream page-by-page and send it over SPI3 + * * note, that bitstream is slightly smaller than two sectors, so we're * sending some 0xFF's after the binary image, which is harmless * (just some dummy clock cycles) */ - prom_addr = prom_offset; - for (page=0; page<num_pages; page++) + for (prom_sector_index = 1; prom_sector_index < N25Q128_NUM_SECTORS; prom_sector_index += 1) { /* read next page */ + prom_addr = prom_sector_index * N25Q128_SECTOR_SIZE; prom_ok = fpgacfg_read_data(prom_addr, prom_buf, N25Q128_PAGE_SIZE); if (prom_ok != HAL_OK) break; /* check magic marker */ - if (page == 0) { - for (c=0; c<sizeof prom_marker; c++) - if (prom_buf[c] != prom_marker[c]) { - prom_marker_bad = 1; - break; - } - } + prom_marker_bad = 0; + for (c=0; c<sizeof prom_marker; c++) + if (prom_buf[c] != prom_marker[c]) { + prom_marker_bad = 1; + break; + } + + /* mkm bitmap found! */ + if (!prom_marker_bad) break; + } + + /* check, that magic marker was correct */ + if (prom_marker_bad) return 2; + + /* send the mkm bitmap */ + for (page=0; page<num_pages; page++) + { + /* read next page */ + prom_ok = fpgacfg_read_data(prom_addr, prom_buf, N25Q128_PAGE_SIZE); + if (prom_ok != HAL_OK) break; /* send page to iCE40 */ prom_ok = HAL_SPI_Transmit(&hspi_ice40mkm, prom_buf, N25Q128_PAGE_SIZE, N25Q128_SPI_TIMEOUT); @@ -167,10 +185,8 @@ int ice40mkm_configure(void) /* relinquish access to FPGA config storage */ fpgacfg_access_control(ALLOW_FPGA); - /* check, that magic marker was correct */ /* check, that all the pages were written */ - if (prom_marker_bad) return 2; - else if (page != num_pages) return 1; + if (page != num_pages) return 1; /* clear chip-select */ _ice40mkm_chip_deselect(); |