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flash/nor/spi: add guide to select proper erase cmd 

Extend comments in flash_devices array.

Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Change-Id: I7ab85a2d37803b6bc9fc7a2a91ae2effb6ec288d
Reviewed-on: https://review.openocd.org/c/openocd/+/7925
Tested-by: jenkins
Reviewed-by: Andreas Bolsch <hyphen0break@gmail.com>
This commit is contained in:
Tomas Vanek 2023-10-02 16:40:23 +02:00
parent a080d9795a
commit e5d26f1546
1 changed files with 21 additions and 4 deletions
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25
src/flash/nor/spi.c
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@ -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),