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kernel: disable software protection bits for macronix flash chips at init

The bootloader of AirOS 5.6.x doesn't remove the flash protection for us,
so we have to do this ourselves.
Matthias Schiffer 8 years ago
parent
commit
89b3dca8b5

+ 22 - 0
patches/openwrt/0043-kernel-disable-software-protection-bits-for-macronix-flash-chips-at-init.patch

@@ -0,0 +1,22 @@
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Fri, 26 Feb 2016 04:24:06 +0100
+Subject: kernel: disable software protection bits for macronix flash chips at init
+
+Backport of r47626
+
+diff --git a/target/linux/generic/patches-3.18/465-m25p80-mx-disable-software-protection.patch b/target/linux/generic/patches-3.18/465-m25p80-mx-disable-software-protection.patch
+new file mode 100644
+index 0000000..d7d7eec
+--- /dev/null
++++ b/target/linux/generic/patches-3.18/465-m25p80-mx-disable-software-protection.patch
+@@ -0,0 +1,10 @@
++--- a/drivers/mtd/spi-nor/spi-nor.c
+++++ b/drivers/mtd/spi-nor/spi-nor.c
++@@ -962,6 +962,7 @@ int spi_nor_scan(struct spi_nor *nor, co
++ 
++ 	if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ATMEL ||
++ 	    JEDEC_MFR(info->jedec_id) == CFI_MFR_INTEL ||
+++	    JEDEC_MFR(info->jedec_id) == CFI_MFR_MACRONIX ||
++ 	    JEDEC_MFR(info->jedec_id) == CFI_MFR_SST) {
++ 		write_enable(nor);
++ 		write_sr(nor, 0);