[PATCH 0/5] MIPS: tplink-mr3020: initial PBL support

[PATCH 0/5] MIPS: tplink-mr3020: initial PBL support

[Antony Pavlov]

This patch series enables PBL for AR9331-based TP-Link MR3020 router.
This makes it possible to implement full-grown bootloader for AR9331-based
boards in the future.

AR9331 lowlevel initialization links:

  * https://github.com/pepe2k/u-boot_mod
  * https://github.com/frantony/barebox/commits/20140507.ar933x.pbl.dirty
  * https://wikidevi.com/wiki/TP-LINK_TL-MR3020#Notes_on_JTAG
  * http://openocd.zylin.com/#/c/2519/
  * http://geektimes.ru/post/245066/
  * http://geektimes.ru/post/249184/
  * http://openocd.zylin.com/#/c/2722/

Antony Pavlov (4):
  MIPS: debug_ll_ns16550.h: drop _ns16550 suffix
  MIPS: mach-ath79: debug_ll.h: add assembler routines
  MIPS: tplink-mr3020: enable nmon
  Documentation: mips: fix tplink-mr3020 instruction

Oleksij Rempel (1):
  MIPS: tplink-mr3020: enable PBL and compression

 Documentation/boards/mips/tplink-mr3020.rst        |   7 +-
 .../img-ci20/include/board/board_pbl_start.h       |   2 +-
 .../loongson-ls1b/include/board/board_pbl_start.h  |   2 +-
 .../netgear-wg102/include/board/board_pbl_start.h  |   6 +-
 .../ritmix-rzx50/include/board/board_pbl_start.h   |   2 +-
 .../tplink-mr3020/include/board/board_pbl_start.h  |  35 ++++++
 arch/mips/include/asm/debug_ll_ns16550.h           |  20 +--
 arch/mips/include/asm/pbl_nmon.h                   |  21 ++--
 arch/mips/mach-ath79/Kconfig                       |   3 +
 arch/mips/mach-ath79/include/mach/debug_ll.h       | 136 ++++++++++++++++++++-
 10 files changed, 199 insertions(+), 35 deletions(-)
 create mode 100644 arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h

-- 
2.1.4


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[PATCH 1/5] MIPS: tplink-mr3020: enable PBL and compression

[Antony Pavlov]

From: Oleksij Rempel <linux@rempel-privat.de>

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 .../tplink-mr3020/include/board/board_pbl_start.h  | 32 ++++++++++++++++++++++
 arch/mips/mach-ath79/Kconfig                       |  2 ++
 2 files changed, 34 insertions(+)

diff --git a/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h b/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h
new file mode 100644
index 0000000..f85c5ad
--- /dev/null
+++ b/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2013, 2015 Antony Pavlov <antonynpavlov@gmail.com>
+ * Copyright (C) 2013 Oleksij Rempel <linux@rempel-privat.de>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <asm/pbl_macros.h>
+
+	.macro	board_pbl_start
+	.set	push
+	.set	noreorder
+
+	mips_barebox_10h
+
+	mips_disable_interrupts
+
+	copy_to_link_location	pbl_start
+
+	.set	pop
+	.endm
diff --git a/arch/mips/mach-ath79/Kconfig b/arch/mips/mach-ath79/Kconfig
index 96fffd3..3fd9cdd 100644
--- a/arch/mips/mach-ath79/Kconfig
+++ b/arch/mips/mach-ath79/Kconfig
@@ -9,6 +9,8 @@ choice
 
 config BOARD_TPLINK_MR3020
 	bool "TP-LINK MR3020"
+	select HAVE_PBL_IMAGE
+	select HAVE_IMAGE_COMPRESSION
 
 endchoice
 
-- 
2.1.4


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[PATCH 2/5] MIPS: debug_ll_ns16550.h: drop _ns16550 suffix

[Antony Pavlov]

This commit makes it possible to have unified debug_ll_*
assembler routines for differrent UART program model.
E.g. we can use debug_ll_putc() routine in common
code without knowledge on exact UART model: ns16550
or ar933x.

Also rename *_check_char -> *_tstc.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 .../boards/img-ci20/include/board/board_pbl_start.h |  2 +-
 .../loongson-ls1b/include/board/board_pbl_start.h   |  2 +-
 .../netgear-wg102/include/board/board_pbl_start.h   |  6 +++---
 .../ritmix-rzx50/include/board/board_pbl_start.h    |  2 +-
 arch/mips/include/asm/debug_ll_ns16550.h            | 20 ++++++++++----------
 arch/mips/include/asm/pbl_nmon.h                    | 21 ++++++++++-----------
 6 files changed, 26 insertions(+), 27 deletions(-)

diff --git a/arch/mips/boards/img-ci20/include/board/board_pbl_start.h b/arch/mips/boards/img-ci20/include/board/board_pbl_start.h
index 26232f5..42d23c8 100644
--- a/arch/mips/boards/img-ci20/include/board/board_pbl_start.h
+++ b/arch/mips/boards/img-ci20/include/board/board_pbl_start.h
@@ -32,7 +32,7 @@
 
 	debug_ll_ns16550_init
 
-	debug_ll_ns16550_outc '.'
+	debug_ll_outc '.'
 	debug_ll_ns16550_outnl
 
 	mips_nmon
diff --git a/arch/mips/boards/loongson-ls1b/include/board/board_pbl_start.h b/arch/mips/boards/loongson-ls1b/include/board/board_pbl_start.h
index 1a92794..a3c585e 100644
--- a/arch/mips/boards/loongson-ls1b/include/board/board_pbl_start.h
+++ b/arch/mips/boards/loongson-ls1b/include/board/board_pbl_start.h
@@ -30,7 +30,7 @@
 
 	debug_ll_ns16550_init
 
-	debug_ll_ns16550_outc '.'
+	debug_ll_outc '.'
 	debug_ll_ns16550_outnl
 
 	mips_nmon
diff --git a/arch/mips/boards/netgear-wg102/include/board/board_pbl_start.h b/arch/mips/boards/netgear-wg102/include/board/board_pbl_start.h
index d74d2c2..9fb2205 100644
--- a/arch/mips/boards/netgear-wg102/include/board/board_pbl_start.h
+++ b/arch/mips/boards/netgear-wg102/include/board/board_pbl_start.h
@@ -35,7 +35,7 @@
 	pbl_ar2312_rst_uart0
 	debug_ll_ns16550_init
 
-	debug_ll_ns16550_outc 'a'
+	debug_ll_outc 'a'
 	debug_ll_ns16550_outnl
 
 	/* check if SDRAM is already configured,
@@ -60,7 +60,7 @@
 	pbl_probe_mem t0, t1, KSEG1
 	beq t0, t1, sdram_configured
 	 nop
-	debug_ll_ns16550_outc '#'
+	debug_ll_outc '#'
 	debug_ll_ns16550_outnl
 
 1:
@@ -68,7 +68,7 @@
 	 nop
 
 sdram_configured:
-	debug_ll_ns16550_outc 'b'
+	debug_ll_outc 'b'
 	debug_ll_ns16550_outnl
 
 	copy_to_link_location	pbl_start
diff --git a/arch/mips/boards/ritmix-rzx50/include/board/board_pbl_start.h b/arch/mips/boards/ritmix-rzx50/include/board/board_pbl_start.h
index fb914d9..7c2fa0b 100644
--- a/arch/mips/boards/ritmix-rzx50/include/board/board_pbl_start.h
+++ b/arch/mips/boards/ritmix-rzx50/include/board/board_pbl_start.h
@@ -32,7 +32,7 @@
 
 	debug_ll_ns16550_init
 
-	debug_ll_ns16550_outc '.'
+	debug_ll_outc '.'
 	debug_ll_ns16550_outnl
 
 	mips_nmon
diff --git a/arch/mips/include/asm/debug_ll_ns16550.h b/arch/mips/include/asm/debug_ll_ns16550.h
index 032f0a2..a3e1c52 100644
--- a/arch/mips/include/asm/debug_ll_ns16550.h
+++ b/arch/mips/include/asm/debug_ll_ns16550.h
@@ -90,7 +90,7 @@ static __inline__ void PUTC_LL(char ch)
 /*
  * output a character in a0
  */
-.macro	debug_ll_ns16550_outc_a0
+.macro	debug_ll_outc_a0
 #ifdef CONFIG_DEBUG_LL
 	.set	push
 	.set	reorder
@@ -110,10 +110,10 @@ static __inline__ void PUTC_LL(char ch)
 /*
  * output a character
  */
-.macro	debug_ll_ns16550_outc chr
+.macro	debug_ll_outc chr
 #ifdef CONFIG_DEBUG_LL
 	li	a0, \chr
-	debug_ll_ns16550_outc_a0
+	debug_ll_outc_a0
 #endif /* CONFIG_DEBUG_LL */
 .endm
 
@@ -122,15 +122,15 @@ static __inline__ void PUTC_LL(char ch)
  */
 .macro	debug_ll_ns16550_outnl
 #ifdef CONFIG_DEBUG_LL
-	debug_ll_ns16550_outc '\r'
-	debug_ll_ns16550_outc '\n'
+	debug_ll_outc '\r'
+	debug_ll_outc '\n'
 #endif /* CONFIG_DEBUG_LL */
 .endm
 
 /*
  * output a 32-bit value in hex
  */
-.macro debug_ll_ns16550_outhexw
+.macro debug_ll_outhexw
 #ifdef CONFIG_DEBUG_LL
 	.set	push
 	.set	reorder
@@ -151,7 +151,7 @@ static __inline__ void PUTC_LL(char ch)
 203:
 	addi	a0, a0, '0'
 
-	debug_ll_ns16550_outc_a0
+	debug_ll_outc_a0
 
 	bgtz	t5, 202b
 
@@ -165,7 +165,7 @@ static __inline__ void PUTC_LL(char ch)
  *  v0 = 0   no character in input buffer
  *  v0 != 0  character in input buffer
  */
-.macro	debug_ll_ns16550_check_char
+.macro	debug_ll_tstc
 #ifdef CONFIG_DEBUG_LL
 	.set	push
 	.set	reorder
@@ -183,13 +183,13 @@ static __inline__ void PUTC_LL(char ch)
 /*
  * get character to v0
  */
-.macro	debug_ll_ns16550_getc
+.macro	debug_ll_getc
 #ifdef CONFIG_DEBUG_LL
 	.set	push
 	.set	reorder
 
 204:
-	debug_ll_ns16550_check_char
+	debug_ll_tstc
 
 	/* try again */
 	beqz	v0, 204b
diff --git a/arch/mips/include/asm/pbl_nmon.h b/arch/mips/include/asm/pbl_nmon.h
index e7baa4c..90e2da8 100644
--- a/arch/mips/include/asm/pbl_nmon.h
+++ b/arch/mips/include/asm/pbl_nmon.h
@@ -17,8 +17,7 @@
  *
  */
 
-#include <board/debug_ll.h>
-#include <asm/debug_ll_ns16550.h>
+#include <mach/debug_ll.h>
 
 #define CODE_ESC	0x1b
 
@@ -74,7 +73,7 @@ nmon_wait_user:
 
 	nmon_outs	msg_bsp
 
-	debug_ll_ns16550_check_char
+	debug_ll_tstc
 
 	bnez	v0, 3f
 
@@ -91,7 +90,7 @@ msg_nmon_press_any_key:
 	.align	4
 3:
 	/* get received char from ns16550's buffer */
-	debug_ll_ns16550_getc
+	debug_ll_getc
 #endif /* CONFIG_NMON_USER_START */
 
 nmon_main_help:
@@ -102,9 +101,9 @@ nmon_main_help:
 nmon_main:
 	nmon_outs	msg_prompt
 
-	debug_ll_ns16550_getc
+	debug_ll_getc
 
-	/* prepare a0 for debug_ll_ns16550_outc_a0 */
+	/* prepare a0 for debug_ll_outc_a0 */
 	move	a0, v0
 
 	li	v1, 'q'
@@ -137,7 +136,7 @@ nmon_cmd_d:
 	nmon_outs	msg_nl
 
 	lw	a0, (v0)
-	debug_ll_ns16550_outhexw
+	debug_ll_outhexw
 
 	b	nmon_main
 
@@ -170,7 +169,7 @@ nmon_cmd_g:
 	b	nmon_main
 
 _nmon_outc_a0:
-	debug_ll_ns16550_outc_a0
+	debug_ll_outc_a0
 	jr	ra
 
 _nmon_outs:
@@ -178,7 +177,7 @@ _nmon_outs:
 	addi	a1, a1, 1
 	beqz	a0, _nmon_jr_ra_exit
 
-	debug_ll_ns16550_outc_a0
+	debug_ll_outc_a0
 
 	b	_nmon_outs
 
@@ -188,7 +187,7 @@ _nmon_gethexw:
 	li	t2, 0
 
 _get_hex_digit:
-	debug_ll_ns16550_getc
+	debug_ll_getc
 
 	li	v1, CODE_ESC
 	beq	v0, v1, nmon_main
@@ -221,7 +220,7 @@ _get_hex_digit:
 	sub	a3, v0, a3
 
 0:	move	a0, v0
-	debug_ll_ns16550_outc_a0
+	debug_ll_outc_a0
 
 	sll	t2, t2, 4
 	or	t2, t2, a3
-- 
2.1.4


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[PATCH 3/5] MIPS: mach-ath79: debug_ll.h: add assembler routines

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/mach-ath79/include/mach/debug_ll.h | 136 ++++++++++++++++++++++++++-
 1 file changed, 131 insertions(+), 5 deletions(-)

diff --git a/arch/mips/mach-ath79/include/mach/debug_ll.h b/arch/mips/mach-ath79/include/mach/debug_ll.h
index de4c00d..c697318 100644
--- a/arch/mips/mach-ath79/include/mach/debug_ll.h
+++ b/arch/mips/mach-ath79/include/mach/debug_ll.h
@@ -18,17 +18,26 @@
 #ifndef __AR933X_DEBUG_LL__
 #define __AR933X_DEBUG_LL__
 
-#include <io.h>
-#include <linux/bitops.h>
 #include <asm/addrspace.h>
 
-#include <mach/ar71xx_regs.h>
+/* Alas! <mach/ar71xx_regs.h> isn't assembly-tolerant */
+#define AR71XX_APB_BASE     0x18000000
+#define AR933X_UART_BASE    (AR71XX_APB_BASE + 0x00020000)
+
+#define DEBUG_LL_UART_ADDR	KSEG1ADDR(AR933X_UART_BASE)
 
 #define AR933X_UART_DATA_REG            0x00
 #define AR933X_UART_DATA_TX_RX_MASK     0xff
-#define AR933X_UART_DATA_TX_CSR         BIT(9)
+#define AR933X_UART_DATA_TX_CSR		0x200
+#define AR933X_UART_DATA_RX_CSR		0x100
 
-#define DEBUG_LL_UART_ADDR	KSEG1ADDR(AR933X_UART_BASE)
+#ifndef __ASSEMBLY__
+
+#include <io.h>
+
+/*
+ * C macros
+ */
 
 static inline void ar933x_debug_ll_writel(u32 b, int offset)
 {
@@ -52,5 +61,122 @@ static inline void PUTC_LL(int ch)
 	data = (ch & AR933X_UART_DATA_TX_RX_MASK) | AR933X_UART_DATA_TX_CSR;
 	ar933x_debug_ll_writel(data, AR933X_UART_DATA_REG);
 }
+#else /* __ASSEMBLY__ */
+/*
+ * Macros for use in assembly language code
+ */
+
+/*
+ * output a character in a0
+ */
+.macro	debug_ll_outc_a0
+#ifdef CONFIG_DEBUG_LL
+	.set	push
+	.set	reorder
+
+	la	t0, DEBUG_LL_UART_ADDR
+201:
+	lw	t1, AR933X_UART_DATA_REG(t0)	/* get line status */
+	andi	t1, t1, AR933X_UART_DATA_TX_CSR	/* check for transmitter empty */
+	beqz	t1, 201b	/* try again */
+	andi	a0, a0, AR933X_UART_DATA_TX_RX_MASK
+	ori	a0, a0, AR933X_UART_DATA_TX_CSR
+	sw	a0, 0(t0)	/* write the character */
+	.set	pop
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * output a character
+ */
+.macro	debug_ll_outc chr
+#ifdef CONFIG_DEBUG_LL
+	li	a0, \chr
+	debug_ll_outc_a0
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * output a 32-bit value in hex
+ */
+.macro debug_ll_outhexw
+#ifdef CONFIG_DEBUG_LL
+	.set	push
+	.set	reorder
+
+	move	t6, a0
+	li		t5, 32
+
+202:
+	addi	t5, t5, -4
+	srlv	a0, t6, t5
+
+	/* output one hex digit */
+	andi	a0, a0, 15
+	blt	a0, 10, 203f
+
+	addi	a0, a0, ('a' - '9' - 1)
+
+203:
+	addi	a0, a0, '0'
+
+	debug_ll_outc_a0
+
+	bgtz	t5, 202b
+
+	.set	pop
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * check character in input buffer
+ * return value:
+ *  v0 = 0   no character in input buffer
+ *  v0 != 0  character in input buffer
+ */
+/* FIXME: use tstc */
+.macro	debug_ll_tstc
+#ifdef CONFIG_DEBUG_LL
+	.set	push
+	.set	reorder
+
+	la	t0, DEBUG_LL_UART_ADDR
+
+	/* get line status and check for data present */
+	lw	v0, AR933X_UART_DATA_REG(t0)
+	andi	v0, v0, AR933X_UART_DATA_RX_CSR
+
+	.set	pop
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * get character to v0
+ */
+.macro	debug_ll_getc
+#ifdef CONFIG_DEBUG_LL
+	.set	push
+	.set	reorder
+
+	la	t0, DEBUG_LL_UART_ADDR
+204:
+	lw	v0, AR933X_UART_DATA_REG(t0)
+	andi	v0, v0, AR933X_UART_DATA_RX_CSR
+
+	/* try again */
+	beqz	v0, 204b
+
+	/* read a character */
+	lw	v0, AR933X_UART_DATA_REG(t0)
+	andi	v0, v0, AR933X_UART_DATA_TX_RX_MASK
+
+	/* remove the character from the FIFO */
+	li	t1, AR933X_UART_DATA_RX_CSR
+	sw  t1, AR933X_UART_DATA_REG(t0)
+
+	.set	pop
+#endif /* CONFIG_DEBUG_LL */
+.endm
+#endif /* __ASSEMBLY__ */
 
 #endif /* __AR933X_DEBUG_LL__ */
-- 
2.1.4


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[PATCH 4/5] MIPS: tplink-mr3020: enable nmon

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h | 3 +++
 arch/mips/mach-ath79/Kconfig                                   | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h b/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h
index f85c5ad..944a510 100644
--- a/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h
+++ b/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h
@@ -17,6 +17,7 @@
  */
 
 #include <asm/pbl_macros.h>
+#include <asm/pbl_nmon.h>
 
 	.macro	board_pbl_start
 	.set	push
@@ -26,6 +27,8 @@
 
 	mips_disable_interrupts
 
+	mips_nmon
+
 	copy_to_link_location	pbl_start
 
 	.set	pop
diff --git a/arch/mips/mach-ath79/Kconfig b/arch/mips/mach-ath79/Kconfig
index 3fd9cdd..f730b37 100644
--- a/arch/mips/mach-ath79/Kconfig
+++ b/arch/mips/mach-ath79/Kconfig
@@ -11,6 +11,7 @@ config BOARD_TPLINK_MR3020
 	bool "TP-LINK MR3020"
 	select HAVE_PBL_IMAGE
 	select HAVE_IMAGE_COMPRESSION
+	select HAS_NMON
 
 endchoice
 
-- 
2.1.4


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[PATCH 5/5] Documentation: mips: fix tplink-mr3020 instruction

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 Documentation/boards/mips/tplink-mr3020.rst | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/boards/mips/tplink-mr3020.rst b/Documentation/boards/mips/tplink-mr3020.rst
index c9e092c..8a95e11 100644
--- a/Documentation/boards/mips/tplink-mr3020.rst
+++ b/Documentation/boards/mips/tplink-mr3020.rst
@@ -23,7 +23,8 @@ But you have to encode barebox image in a very special way.
 First obtain ``lzma`` and ``mktplinkfw`` utilities.
 
 The ``lzma`` utility can be obtained in Debian/Ubuntu
-distro by installing lzma package.
+distro by installing lzma package
+(lzma from xz-utils package is unusable).
 
 The ``mktplinkfw`` utility can be obtained from openwrt, e.g.::
 
@@ -36,8 +37,8 @@ The ``mktplinkfw`` utility can be obtained from openwrt, e.g.::
 To convert your barebox.bin to U-Boot-loadable image (``6F01A8C0.img``)
 use this command sequence::
 
-  $ lzma -c -k barebox.bin > barebox.lzma
-  $ ./FW/mktplinkfw -c -H 0x07200103 -W 1 -N TL-WR720N-v3 \
+  $ lzma -c -k barebox-flash-image > barebox.lzma
+  $ ./mktplinkfw -c -H 0x07200103 -W 1 -N TL-WR720N-v3 \
       -s -F 4Mlzma -k barebox.lzma -o 6F01A8C0.img
 
 You must setup tftp-server on host 192.168.0.1.
-- 
2.1.4


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Re: [PATCH 0/5] MIPS: tplink-mr3020: initial PBL support

[Sascha Hauer]

On Mon, May 04, 2015 at 03:29:20PM +0300, Antony Pavlov wrote:
> This patch series enables PBL for AR9331-based TP-Link MR3020 router.
> This makes it possible to implement full-grown bootloader for AR9331-based
> boards in the future.
> 
> AR9331 lowlevel initialization links:
> 
>   * https://github.com/pepe2k/u-boot_mod
>   * https://github.com/frantony/barebox/commits/20140507.ar933x.pbl.dirty
>   * https://wikidevi.com/wiki/TP-LINK_TL-MR3020#Notes_on_JTAG
>   * http://openocd.zylin.com/#/c/2519/
>   * http://geektimes.ru/post/245066/
>   * http://geektimes.ru/post/249184/
>   * http://openocd.zylin.com/#/c/2722/
> 
> Antony Pavlov (4):
>   MIPS: debug_ll_ns16550.h: drop _ns16550 suffix
>   MIPS: mach-ath79: debug_ll.h: add assembler routines
>   MIPS: tplink-mr3020: enable nmon
>   Documentation: mips: fix tplink-mr3020 instruction
> 
> Oleksij Rempel (1):
>   MIPS: tplink-mr3020: enable PBL and compression

Applied, thanks

Sascha


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