This is tested and works on ubnt-erx.
Signed-off-by: Nikolay Martynov <[email protected]>
---
v2: set palmbus region to same boundaries as stock u-boot
---
.../0060-mt7621-set-up-palmbus-memory-region.patch | 36 ++++++++++++++++++++++
1 file changed, 36 insertions(+)
create mode 100644
target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch
diff --git
a/target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch
b/target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch
new file mode 100644
index 0000000..ba462bf
--- /dev/null
+++
b/target/linux/ramips/patches-4.3/0060-mt7621-set-up-palmbus-memory-region.patch
@@ -0,0 +1,36 @@
+--- a/arch/mips/include/asm/mach-ralink/mt7621.h
++++ b/arch/mips/include/asm/mach-ralink/mt7621.h
+@@ -13,6 +13,9 @@
+ #ifndef _MT7621_REGS_H_
+ #define _MT7621_REGS_H_
+
++#define MT7621_PALMBUS_BASE 0x1C000000
++#define MT7621_PALMBUS_SIZE 0x03FFFFFF
++
+ #define MT7621_SYSC_BASE 0x1E000000
+
+ #define SYSC_REG_CHIP_NAME0 0x00
+--- a/arch/mips/ralink/mt7621.c
++++ b/arch/mips/ralink/mt7621.c
+@@ -204,6 +204,21 @@ void prom_soc_init(struct ralink_soc_inf
+ mips_cm_probe();
+ mips_cpc_probe();
+
++ if (mips_cm_numiocu()) {
++ /* mips_cm_probe() wipes out bootloader
++ config for CM regions and we have to configure them
++ again. This SoC cannot talk to pamlbus devices
++ witout proper iocu region set up.
++
++ FIXME: it would be better to do this with values
++ from DT, but we need this very early because
++ without this we cannot talk to pretty much anything
++ including serial.
++ */
++ write_gcr_reg0_base(MT7621_PALMBUS_BASE);
++ write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE |
CM_GCR_REGn_MASK_CMTGT_IOCU0);
++ }
++
+ if (!register_cps_smp_ops())
+ return;
+ if (!register_cmp_smp_ops())
--
2.6.4
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