diff options
| -rw-r--r-- | src/flash/nor/spi.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/src/flash/nor/spi.c b/src/flash/nor/spi.c index ace274f..bf654f9 100644 --- a/src/flash/nor/spi.c +++ b/src/flash/nor/spi.c @@ -22,10 +22,22 @@ /* Shared table of known SPI flash devices for SPI-based flash drivers. Taken * from device datasheets and Linux SPI flash drivers. */ const struct flash_device flash_devices[] = { - /* name, read_cmd, qread_cmd, pprog_cmd, erase_cmd, chip_erase_cmd, device_id, - * pagesize, sectorsize, size_in_bytes - * note: device id is usually 3 bytes long, however the unused highest byte counts - * continuation codes for manufacturer id as per JEP106xx */ + /* Note: device_id is usually 3 bytes long, however the unused highest byte counts + * continuation codes for manufacturer id as per JEP106xx. + * + * All sizes (page, sector/block and flash) are in bytes. + * + * Guide to select a proper erase command (if both sector and block erase cmds are available): + * Use 4kbit sector erase cmd and set erase size to the size of sector for small devices + * (4Mbit and less, size <= 0x80000) to prevent too raw erase granularity. + * Use 64kbit block erase cmd and set erase size to the size of block for bigger devices + * (8Mbit and more, size >= 0x100000) to keep erase speed reasonable. + * If the device implements also 32kbit block erase, use it for 8Mbit, size == 0x100000. + */ + /* name read qread page erase chip device_id page erase flash + * _cmd _cmd _prog _cmd* _erase size size* size + * _cmd _cmd + */ FLASH_ID("st m25pe10", 0x03, 0x00, 0x02, 0xd8, 0x00, 0x00118020, 0x100, 0x10000, 0x20000), FLASH_ID("st m25pe20", 0x03, 0x00, 0x02, 0xd8, 0x00, 0x00128020, 0x100, 0x10000, 0x40000), FLASH_ID("st m25pe40", 0x03, 0x00, 0x02, 0xd8, 0x00, 0x00138020, 0x100, 0x10000, 0x80000), @@ -174,6 +186,11 @@ const struct flash_device flash_devices[] = { FLASH_ID("zetta zd25q16", 0x03, 0x00, 0x02, 0xd8, 0xc7, 0x001560ba, 0x100, 0x10000, 0x200000), /* FRAM, no erase commands, no write page or sectors */ + + /* name read qread page device_id total + * _cmd _cmd _prog size + * _cmd + */ FRAM_ID("fu mb85rs16n", 0x03, 0, 0x02, 0x00010104, 0x800), FRAM_ID("fu mb85rs32v", 0x03, 0, 0x02, 0x00010204, 0x1000), /* exists ? */ FRAM_ID("fu mb85rs64v", 0x03, 0, 0x02, 0x00020304, 0x2000), |