Citeren Weijie Gao <hackpas...@gmail.com>:
2015-11-08 4:42 GMT+08:00 Shonn Lu <countryside...@qq.com>:
Signed-off-by: Shonn Lu <countryside...@qq.com>
---
.../0064-reset-m25p80-when-shutdown.patch | 24
++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644
target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
diff --git
a/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
new file mode 100644
index 0000000..76f916a
--- /dev/null
+++
b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
@@ -0,0 +1,24 @@
+--- a/drivers/mtd/devices/m25p80.c
++++ b/drivers/mtd/devices/m25p80.c
+@@ -319,6 +319,12 @@
+ {
+ struct m25p *flash = spi_get_drvdata(spi);
+
++ // play4fun: add spi flash reset code
++ flash->command[0] = 0x66;
++ spi_write(flash->spi, flash->command, 1);
++ flash->command[0] = 0x99;
++ spi_write(flash->spi, flash->command, 1);
++
+ /* Clean up MTD stuff. */
+ return mtd_device_unregister(&flash->mtd);
+ }
+@@ -382,6 +388,8 @@
+ .id_table = m25p_ids,
+ .probe = m25p_probe,
+ .remove = m25p_remove,
++ // play4fun add shutdown method to reset spi flash
++ .shutdown = m25p_remove,
+
+ /* REVISIT: many of these chips have deep power-down modes, which
+ * should clearly be entered on suspend() to minimize power use.
--
1.9.1
_______________________________________________
openwrt-devel mailing list
openwrt-devel@lists.openwrt.org
https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
This is not enough for w25q256.
It is.
The Extended Address Register (EAR) must be cleared, or the higher half
16MB may be accessed in 3-byte addressing mode, and this will cause a boot
failure.
From the W25Q256FV datasheet (page 23):
"Upon power up or after the execution of a Software/Hardware
Reset, the Extended Address Register
values will be cleared to 0."
So sending the device a software reset, should be sufficient as the
EAR will be cleared.
_______________________________________________
openwrt-devel mailing list
openwrt-devel@lists.openwrt.org
https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
