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authorMacpaul Lin <macpaul@andestech.com>2011-10-19 20:41:05 +0000
committerWolfgang Denk <wd@denx.de>2011-10-22 00:52:36 +0200
commit37e5708afa9527d21b37bce72f637b9aed31c930 (patch)
tree9774de0bc0a275173f14191d7a6c50976c44408d /arch/nds32
parente70838444c7985ee91e79c2d824acb98a5fb8556 (diff)
downloadu-boot-linaro-stable-37e5708afa9527d21b37bce72f637b9aed31c930.tar.gz
nds32/core N1213: NDS32 N12 core family N1213
Add N1213 cpu core (N12 Core family) support for NDS32 arch. This patch includes start.S for the initialize procedure of N1213. Start procedure: start.S will start up the N1213 CPU core at first, then jump to SoC dependent "lowlevel_init.S" and "watchdog.S" to configure peripheral devices. Signed-off-by: Macpaul Lin <macpaul@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com>
Diffstat (limited to 'arch/nds32')
-rw-r--r--arch/nds32/cpu/n1213/Makefile50
-rw-r--r--arch/nds32/cpu/n1213/start.S529
-rw-r--r--arch/nds32/cpu/n1213/u-boot.lds70
3 files changed, 649 insertions, 0 deletions
diff --git a/arch/nds32/cpu/n1213/Makefile b/arch/nds32/cpu/n1213/Makefile
new file mode 100644
index 000000000..da155748e
--- /dev/null
+++ b/arch/nds32/cpu/n1213/Makefile
@@ -0,0 +1,50 @@
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# Copyright (C) 2011 Andes Technology Corporation
+# Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+# Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+#
+# 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 as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB = $(obj)lib$(CPU).o
+
+START = start.o
+
+SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS))
+START := $(addprefix $(obj),$(START))
+
+all: $(obj).depend $(START) $(LIB)
+
+$(LIB): $(OBJS)
+ $(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/nds32/cpu/n1213/start.S b/arch/nds32/cpu/n1213/start.S
new file mode 100644
index 000000000..1d1fcf77e
--- /dev/null
+++ b/arch/nds32/cpu/n1213/start.S
@@ -0,0 +1,529 @@
+/*
+ * Andesboot - Startup Code for Whitiger core
+ *
+ * Copyright (C) 2006 Andes Technology Corporation
+ * Copyright (C) 2006 Shawn Lin <nobuhiro@andestech.com>
+ * Copyright (C) 2011 Macpaul Lin <macpaul@andestech.com>
+ * Greentime Hu <greentime@andestech.com>
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <common.h>
+#include <asm/macro.h>
+#include <version.h>
+
+/*
+ * Jump vector table for EVIC mode
+ */
+#define ENA_DCAC 2UL
+#define DIS_DCAC ~ENA_DCAC
+#define ICAC_MEM_KBF_ISET (0x07) ! I Cache sets per way
+#define ICAC_MEM_KBF_IWAY (0x07<<3) ! I cache ways
+#define ICAC_MEM_KBF_ISZ (0x07<<6) ! I cache line size
+#define DCAC_MEM_KBF_DSET (0x07) ! D Cache sets per way
+#define DCAC_MEM_KBF_DWAY (0x07<<3) ! D cache ways
+#define DCAC_MEM_KBF_DSZ (0x07<<6) ! D cache line size
+
+#define PSW $ir0
+#define EIT_INTR_PSW $ir1 ! interruption $PSW
+#define EIT_PREV_IPSW $ir2 ! previous $IPSW
+#define EIT_IVB $ir3 ! intr vector base address
+#define EIT_EVA $ir4 ! MMU related Exception VA reg
+#define EIT_PREV_EVA $ir5 ! previous $eva
+#define EIT_ITYPE $ir6 ! interruption type
+#define EIT_PREV_ITYPE $ir7 ! prev intr type
+#define EIT_MACH_ERR $ir8 ! machine error log
+#define EIT_INTR_PC $ir9 ! Interruption PC
+#define EIT_PREV_IPC $ir10 ! previous $IPC
+#define EIT_OVL_INTR_PC $ir11 ! overflow interruption PC
+#define EIT_PREV_P0 $ir12 ! prev $P0
+#define EIT_PREV_P1 $ir13 ! prev $p1
+#define CR_ICAC_MEM $cr1 ! I-cache/memory config reg
+#define CR_DCAC_MEM $cr2 ! D-cache/memory config reg
+#define MR_CAC_CTL $mr8
+
+.globl _start
+
+_start: j reset
+ j tlb_fill
+ j tlb_not_present
+ j tlb_misc
+ j tlb_vlpt_miss
+ j cache_parity_error
+ j debug
+ j general_exception
+ j internal_interrupt ! H0I
+ j internal_interrupt ! H1I
+ j internal_interrupt ! H2I
+ j internal_interrupt ! H3I
+ j internal_interrupt ! H4I
+ j internal_interrupt ! H5I
+
+ .balign 16
+
+/*
+ * Andesboot Startup Code (reset vector)
+ *
+ * 1. bootstrap
+ * 1.1 reset - start of u-boot
+ * 1.2 to superuser mode - as is when reset
+ * 1.4 Do lowlevel_init
+ * - (this will jump out to lowlevel_init.S in SoC)
+ * - (lowlevel_init)
+ * 1.3 Turn off watchdog timer
+ * - (this will jump out to watchdog.S in SoC)
+ * - (turnoff_watchdog)
+ * 2. Do critical init when reboot (not from mem)
+ * 3. Relocate andesboot to ram
+ * 4. Setup stack
+ * 5. Jump to second stage (board_init_r)
+ */
+
+/* Note: TEXT_BASE is defined by the (board-dependent) linker script */
+.globl _TEXT_BASE
+_TEXT_BASE:
+ .word CONFIG_SYS_TEXT_BASE
+
+/*
+ * These are defined in the board-specific linker script.
+ * Subtracting _start from them lets the linker put their
+ * relative position in the executable instead of leaving
+ * them null.
+ */
+#ifdef CONFIG_USE_IRQ
+/* IRQ stack memory (calculated at run-time) */
+.globl IRQ_STACK_START
+IRQ_STACK_START:
+ .word 0x0badc0de
+
+/* IRQ stack memory (calculated at run-time) */
+.globl FIQ_STACK_START
+FIQ_STACK_START:
+ .word 0x0badc0de
+#endif
+
+/* IRQ stack memory (calculated at run-time) + 8 bytes */
+.globl IRQ_STACK_START_IN
+IRQ_STACK_START_IN:
+ .word 0x0badc0de
+
+/*
+ * The bootstrap code of nds32 core
+ */
+
+reset:
+set_ivb:
+ li $r0, 0x0
+
+ /* turn on BTB */
+ mtsr $r0, $misc_ctl
+ /* set IVIC, vector size: 4 bytes, base: 0x0 */
+ mtsr $r0, $ivb
+
+load_lli:
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+ jal load_lowlevel_init
+ jral $p0
+#endif
+
+/*
+ * Set the N1213 (Whitiger) core to superuser mode
+ * According to spec, it is already when reset
+ */
+turnoff_wtdog:
+#ifndef CONFIG_SKIP_TRUNOFF_WATCHDOG
+ jal load_turnoff_watchdog
+ jral $p0
+#endif
+
+/*
+ * Do CPU critical regs init only at reboot,
+ * not when booting from ram
+ */
+#ifdef CONFIG_INIT_CRITICAL
+ bal cpu_init_crit ! Do CPU critical regs init
+#endif
+
+/*
+ * Set stackpointer in internal RAM to call board_init_f
+ * $sp must be 8-byte alignment for ABI compliance.
+ */
+call_board_init_f:
+ li $sp, CONFIG_SYS_INIT_SP_ADDR
+ li $r0, 0x00000000
+
+#ifdef __PIC__
+#ifdef __NDS32_N1213_43U1H__
+/* __NDS32_N1213_43U1H__ implies NDS32 V0 ISA */
+ la $r15, board_init_f ! store function address into $r15
+#endif
+#endif
+ j board_init_f ! jump to board_init_f() in lib/board.c
+
+/*
+ * void relocate_code (addr_sp, gd, addr_moni)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ */
+.globl relocate_code
+relocate_code:
+ move $r4, $r0 /* save addr_sp */
+ move $r5, $r1 /* save addr of gd */
+ move $r6, $r2 /* save addr of destination */
+
+/* Set up the stack */
+stack_setup:
+ move $sp, $r4
+
+ la $r0, _start
+
+ beq $r0, $r6, clear_bss /* skip relocation */
+
+ move $r1, $r6 /* r1 <- scratch for copy_loop */
+ la $r3, __bss_start
+ sub $r3, $r3, $r0 /* r3 <- __bss_start_ofs */
+ add $r2, $r0, $r3 /* r2 <- source end address */
+
+copy_loop:
+ lwi.p $r7, [$r0], #4
+ swi.p $r7, [$r1], #4
+ blt $r0, $r2, copy_loop
+
+/*
+ * fix relocations related issues
+ */
+fix_relocations:
+ l.w $r0, _TEXT_BASE /* r0 <- Text base */
+ sub $r9, $r6, $r0 /* r9 <- relocation offset */
+
+fix_got:
+/*
+ * Now we want to update GOT.
+ *
+ * GOT[0] is reserved. GOT[1] is also reserved for the dynamic object
+ * generated by GNU ld. Skip these reserved entries from relocation.
+ */
+ la $r2, __got_start /* r2 <- rel __got_start in FLASH */
+ add $r2, $r2, $r9 /* r2 <- rel __got_start in RAM */
+ la $r3, __got_end /* r3 <- rel __got_end in FLASH */
+ add $r3, $r3, $r9 /* r3 <- rel __got_end in RAM */
+ addi $r2, $r2, #8 /* skipping first two entries */
+fix_got_loop:
+ lwi $r0, [$r2] /* r0 <- location in FLASH to fix up */
+ add $r0, $r0, $r9 /* r0 <- location fix up to RAM */
+ swi.p $r0, [$r2], #4 /* r0 <- store fix into .got in RAM */
+ blt $r2, $r3, fix_got_loop
+
+clear_bss:
+ la $r0, __bss_start /* r0 <- rel __bss_start in FLASH */
+ add $r0, $r0, $r9 /* r0 <- rel __bss_start in FLASH */
+ la $r1, __bss_end__ /* r1 <- rel __bss_end in RAM */
+ add $r1, $r1, $r9 /* r0 <- rel __bss_end in RAM */
+ li $r2, 0x00000000 /* clear */
+
+clbss_l:
+ sw $r2, [$r0] /* clear loop... */
+ addi $r0, $r0, #4
+ bne $r0, $r1, clbss_l
+
+/*
+ * We are done. Do not return, instead branch to second part of board
+ * initialization, now running from RAM.
+ */
+call_board_init_r:
+ la $r0, board_init_r
+ move $lp, $r0 /* offset of board_init_r() */
+ add $lp, $lp, $r9 /* real address of board_init_r() */
+ /* setup parameters for board_init_r */
+ move $r0, $r5 /* gd_t */
+ move $r1, $r6 /* dest_addr */
+
+#ifdef __PIC__
+#ifdef __NDS32_N1213_43U1H__ /* NDS32 V0 ISA */
+ move $r15, $lp /* store function address into $r15 */
+#endif
+#endif
+
+ /* jump to it ... */
+ jr $lp /* jump to board_init_r() */
+
+/*
+ * Initialize CPU critical registers
+ *
+ * 1. Setup control registers
+ * 1.1 Mask all IRQs
+ * 1.2 Flush cache and TLB
+ * 1.3 Disable MMU and cache
+ * 2. Setup memory timing
+ */
+
+cpu_init_crit:
+
+ move $r0, $lp /* push ra */
+
+ /* Disable Interrupts by clear GIE in $PSW reg */
+ setgie.d
+
+ /* Flush caches and TLB */
+ /* Invalidate caches */
+ bal invalidate_icac
+ bal invalidate_dcac
+
+ /* Flush TLB */
+ mfsr $p0, $MMU_CFG
+ andi $p0, $p0, 0x3 ! MMPS
+ li $p1, 0x2 ! TLB MMU
+ bne $p0, $p1, 1f
+ tlbop flushall ! Flush TLB
+
+1:
+ ! Disable MMU, Dcache
+ ! Whitiger is MMU disabled when reset
+ ! Disable the D$
+ mfsr $p0, MR_CAC_CTL ! Get the $CACHE_CTL reg
+ li $p1, DIS_DCAC
+ and $p0, $p0, $p1 ! Set DC_EN bit
+ mtsr $p0, MR_CAC_CTL ! write back the $CACHE_CTL reg
+ isb
+
+ move $lp, $r0
+2:
+ ret
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+load_lowlevel_init:
+ la $r6, lowlevel_init
+ la $r7, load_lli + 4
+ sub $p0, $r6, $r7
+ add $p0, $p0, $lp
+ret
+#endif
+
+#ifndef CONFIG_SKIP_TRUNOFF_WATCHDOG
+load_turnoff_watchdog:
+ la $r6, turnoff_watchdog
+ la $r7, turnoff_wtdog + 4
+ sub $p0, $r6, $r7
+ add $p0, $p0, $lp
+ret
+#endif
+
+/*
+ * Invalidate I$
+ */
+invalidate_icac:
+ ! read $cr1(I CAC/MEM cfg. reg.) configuration
+ mfsr $t0, CR_ICAC_MEM
+
+ ! Get the ISZ field
+ andi $p0, $t0, ICAC_MEM_KBF_ISZ
+
+ ! if $p0=0, then no I CAC existed
+ beqz $p0, end_flush_icache
+
+ ! get $p0 the index of I$ block
+ srli $p0, $p0, 6
+
+ ! $t1= bit width of I cache line size(ISZ)
+ addi $t1, $p0, 2
+
+ li $t4, 1
+ sll $t5, $t4, $t1 ! get $t5 cache line size
+ andi $p1, $t0, ICAC_MEM_KBF_ISET ! get the ISET field
+ addi $t2, $p1, 6 ! $t2= bit width of ISET
+ andi $p1, $t0, ICAC_MEM_KBF_IWAY ! get bitfield of Iway
+ srli $p1, $p1, 3
+ addi $p1, $p1, 1 ! then $p1 is I way number
+ add $t3, $t2, $t1 ! SHIFT
+ sll $p1, $p1, $t3 ! GET the total cache size
+ICAC_LOOP:
+ sub $p1, $p1, $t5
+ cctl $p1, L1I_IX_INVAL
+ bnez $p1, ICAC_LOOP
+end_flush_icache:
+ ret
+
+/*
+ * Invalidate D$
+ */
+invalidate_dcac:
+ ! read $cr2(D CAC/MEM cfg. reg.) configuration
+ mfsr $t0, CR_DCAC_MEM
+
+ ! Get the DSZ field
+ andi $p0, $t0, DCAC_MEM_KBF_DSZ
+
+ ! if $p0=0, then no D CAC existed
+ beqz $p0, end_flush_dcache
+
+ ! get $p0 the index of D$ block
+ srli $p0, $p0, 6
+
+ ! $t1= bit width of D cache line size(DSZ)
+ addi $t1, $p0, 2
+
+ li $t4, 1
+ sll $t5, $t4, $t1 ! get $t5 cache line size
+ andi $p1, $t0, DCAC_MEM_KBF_DSET ! get the DSET field
+ addi $t2, $p1, 6 ! $t2= bit width of DSET
+ andi $p1, $t0, DCAC_MEM_KBF_DWAY ! get bitfield of D way
+ srli $p1, $p1, 3
+ addi $p1, $p1, 1 ! then $p1 is D way number
+ add $t3, $t2, $t1 ! SHIFT
+ sll $p1, $p1, $t3 ! GET the total cache size
+DCAC_LOOP:
+ sub $p1, $p1, $t5
+ cctl $p1, L1D_IX_INVAL
+ bnez $p1, DCAC_LOOP
+end_flush_dcache:
+ ret
+
+/*
+ * Interrupt handling
+ */
+
+/*
+ * exception handlers
+ */
+ .align 5
+
+.macro SAVE_ALL
+ ! FIXME: Other way to get PC?
+ ! FIXME: Update according to the newest spec!!
+1:
+ la $r28, 1
+ push $r28
+ mfsr $r28, PSW ! $PSW
+ push $r28
+ mfsr $r28, EIT_EVA ! $ir1 $EVA
+ push $r28
+ mfsr $r28, EIT_ITYPE ! $ir2 $ITYPE
+ push $r28
+ mfsr $r28, EIT_MACH_ERR ! $ir3 Mach Error
+ push $r28
+ mfsr $r28, EIT_INTR_PSW ! $ir5 $IPSW
+ push $r28
+ mfsr $r28, EIT_PREV_IPSW ! $ir6 prev $IPSW
+ push $r28
+ mfsr $r28, EIT_PREV_EVA ! $ir7 prev $EVA
+ push $r28
+ mfsr $r28, EIT_PREV_ITYPE ! $ir8 prev $ITYPE
+ push $r28
+ mfsr $r28, EIT_INTR_PC ! $ir9 Interruption PC
+ push $r28
+ mfsr $r28, EIT_PREV_IPC ! $ir10 prev INTR_PC
+ push $r28
+ mfsr $r28, EIT_OVL_INTR_PC ! $ir11 Overflowed INTR_PC
+ push $r28
+ mfusr $r28, $d1.lo
+ push $r28
+ mfusr $r28, $d1.hi
+ push $r28
+ mfusr $r28, $d0.lo
+ push $r28
+ mfusr $r28, $d0.hi
+ push $r28
+ pushm $r0, $r30 ! store $sp-$r31, ra-$r30, $gp-$r29, $r28-$fp
+ addi $sp, $sp, -4 ! make room for implicit pt_regs parameters
+.endm
+
+ .align 5
+tlb_fill:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 1 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+tlb_not_present:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 2 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+tlb_misc:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 3 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+tlb_vlpt_miss:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 4 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+cache_parity_error:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 5 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+debug:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 6 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+general_exception:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 7 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+internal_interrupt:
+ SAVE_ALL
+ move $r0, $sp ! To get the kernel stack
+ li $r1, 8 ! Determine interruption type
+ bal do_interruption
+
+ .align 5
+
+/*
+ * void reset_cpu(ulong addr);
+ * $r0: input address to jump to
+ */
+.globl reset_cpu
+reset_cpu:
+/* No need to disable MMU because we never enable it */
+
+ bal invalidate_icac
+ bal invalidate_dcac
+ mfsr $p0, $MMU_CFG
+ andi $p0, $p0, 0x3 ! MMPS
+ li $p1, 0x2 ! TLB MMU
+ bne $p0, $p1, 1f
+ tlbop flushall ! Flush TLB
+1:
+ mfsr $p0, MR_CAC_CTL ! Get the $CACHE_CTL reg
+ li $p1, DIS_DCAC
+ and $p0, $p0, $p1 ! Clear the DC_EN bit
+ mtsr $p0, MR_CAC_CTL ! Write back the $CACHE_CTL reg
+ br $r0 ! Jump to the input address
diff --git a/arch/nds32/cpu/n1213/u-boot.lds b/arch/nds32/cpu/n1213/u-boot.lds
new file mode 100644
index 000000000..45221ee78
--- /dev/null
+++ b/arch/nds32/cpu/n1213/u-boot.lds
@@ -0,0 +1,70 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+OUTPUT_FORMAT("elf32-nds32", "elf32-nds32", "elf32-nds32")
+OUTPUT_ARCH(nds32)
+ENTRY(_start)
+SECTIONS
+{
+ . = ALIGN(4);
+ .text :
+ {
+ arch/nds32/cpu/n1213/start.o (.text)
+ *(.text)
+ }
+
+ . = ALIGN(4);
+ .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
+
+ . = ALIGN(4);
+ .data : { *(.data) }
+
+ . = ALIGN(4);
+
+ .got : {
+ __got_start = .;
+ *(.got.plt) *(.got)
+ __got_end = .;
+ }
+
+ . = .;
+ __u_boot_cmd_start = .;
+ .u_boot_cmd : { *(.u_boot_cmd) }
+ __u_boot_cmd_end = .;
+
+ . = ALIGN(4);
+
+ _end = .;
+
+ .bss : {
+ __bss_start = .;
+ *(.bss)
+ . = ALIGN(4);
+ __bss_end__ = .;
+ }
+
+}