microblaze: Add SPL support
Add support for U-BOOT SPL. NOR and RAM mode are supported.
There are 3 images in NOR flash. u-boot.img, dtb and kernel.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/cpu/Makefile b/arch/microblaze/cpu/Makefile
index 6e201f2..4955e81 100644
--- a/arch/microblaze/cpu/Makefile
+++ b/arch/microblaze/cpu/Makefile
@@ -8,3 +8,4 @@
extra-y = start.o
obj-y = irq.o
obj-y += cpu.o interrupts.o cache.o exception.o timer.o
+obj-$(CONFIG_SPL_BUILD) += spl.o
diff --git a/arch/microblaze/cpu/spl.c b/arch/microblaze/cpu/spl.c
new file mode 100644
index 0000000..0912261
--- /dev/null
+++ b/arch/microblaze/cpu/spl.c
@@ -0,0 +1,55 @@
+/*
+ * (C) Copyright 2013 - 2014 Xilinx, Inc
+ *
+ * Michal Simek <michal.simek@xilinx.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <image.h>
+#include <spl.h>
+#include <version.h>
+#include <asm/io.h>
+#include <asm/u-boot.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+bool boot_linux;
+
+u32 spl_boot_device(void)
+{
+ return BOOT_DEVICE_NOR;
+}
+
+/* Board initialization after bss clearance */
+void spl_board_init(void)
+{
+ gd = (gd_t *)CONFIG_SPL_STACK_ADDR;
+
+ /* enable console uart printing */
+ preloader_console_init();
+}
+
+#ifdef CONFIG_SPL_OS_BOOT
+void __noreturn jump_to_image_linux(void *arg)
+{
+ debug("Entering kernel arg pointer: 0x%p\n", arg);
+ typedef void (*image_entry_arg_t)(char *, ulong, ulong)
+ __attribute__ ((noreturn));
+ image_entry_arg_t image_entry =
+ (image_entry_arg_t)spl_image.entry_point;
+
+ image_entry(NULL, 0, (ulong)arg);
+}
+#endif /* CONFIG_SPL_OS_BOOT */
+
+int spl_start_uboot(void)
+{
+#ifdef CONFIG_SPL_OS_BOOT
+ if (boot_linux)
+ return 0;
+#endif
+
+ return 1;
+}
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index 8928024..1757bbf 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -22,6 +22,11 @@
*/
mts rmsr, r0 /* disable cache */
+
+#if defined(CONFIG_SPL_BUILD)
+ addi r1, r0, CONFIG_SPL_STACK_ADDR
+ addi r1, r1, -4 /* Decrement SP to top of memory */
+#else
addi r1, r0, CONFIG_SYS_INIT_SP_OFFSET
addi r1, r1, -4 /* Decrement SP to top of memory */
@@ -115,6 +120,7 @@
sh r7, r0, r8
rsubi r8, r10, 0x26
sh r6, r0, r8
+#endif /* BUILD_SPL */
/* Flush cache before enable cache */
addik r5, r0, 0
@@ -139,9 +145,14 @@
cmp r6, r5, r4 /* check if we have reach the end */
bnei r6, 2b
3: /* jumping to board_init */
+#ifndef CONFIG_SPL_BUILD
brai board_init_f
+#else
+ brai board_init_r
+#endif
1: bri 1b
+#ifndef CONFIG_SPL_BUILD
/*
* Read 16bit little endian
*/
@@ -174,3 +185,4 @@
rtsd r15, 8
or r0, r0, r0
.end out16
+#endif
diff --git a/arch/microblaze/cpu/timer.c b/arch/microblaze/cpu/timer.c
index 69ae6d4..3960bbb 100644
--- a/arch/microblaze/cpu/timer.c
+++ b/arch/microblaze/cpu/timer.c
@@ -34,6 +34,7 @@
}
}
+#ifndef CONFIG_SPL_BUILD
static void timer_isr(void *arg)
{
timestamp++;
@@ -62,10 +63,15 @@
if (ret)
tmr = NULL;
}
-
/* No problem if timer is not found/initialized */
return 0;
}
+#else
+int timer_init(void)
+{
+ return 0;
+}
+#endif
/*
* This function is derived from PowerPC code (read timebase as long long).
diff --git a/arch/microblaze/cpu/u-boot-spl.lds b/arch/microblaze/cpu/u-boot-spl.lds
new file mode 100644
index 0000000..96353cd
--- /dev/null
+++ b/arch/microblaze/cpu/u-boot-spl.lds
@@ -0,0 +1,57 @@
+/*
+ * (C) Copyright 2013 - 2014 Xilinx, Inc
+ *
+ * Michal Simek <michal.simek@xilinx.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+
+OUTPUT_ARCH(microblaze)
+ENTRY(_start)
+
+SECTIONS
+{
+ .text ALIGN(0x4):
+ {
+ __text_start = .;
+ arch/microblaze/cpu/start.o (.text)
+ *(.text)
+ *(.text.*)
+ __text_end = .;
+ }
+
+ .rodata ALIGN(0x4):
+ {
+ __rodata_start = .;
+ *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
+ __rodata_end = .;
+ }
+
+ .data ALIGN(0x4):
+ {
+ __data_start = .;
+ *(.data)
+ *(.data.*)
+ __data_end = .;
+ }
+
+ .bss ALIGN(0x4):
+ {
+ __bss_start = .;
+ *(.sbss)
+ *(.scommon)
+ *(.bss)
+ *(.bss.*)
+ *(COMMON)
+ . = ALIGN(4);
+ __bss_end = .;
+ }
+ __end = . ;
+}
+
+#if defined(CONFIG_SPL_MAX_FOOTPRINT)
+ASSERT(__end - _start < (CONFIG_SPL_MAX_FOOTPRINT), \
+ "SPL image plus BSS too big");
+#endif
diff --git a/arch/microblaze/include/asm/spl.h b/arch/microblaze/include/asm/spl.h
new file mode 100644
index 0000000..c1cae6c
--- /dev/null
+++ b/arch/microblaze/include/asm/spl.h
@@ -0,0 +1,16 @@
+/*
+ * (C) Copyright 2013 - 2014 Xilinx, Inc
+ *
+ * Michal Simek <michal.simek@xilinx.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _ASM_MICROBLAZE_SPL_H_
+#define _ASM_MICROBLAZE_SPL_H_
+
+#define BOOT_DEVICE_RAM 1
+#define BOOT_DEVICE_NOR 2
+#define BOOT_DEVICE_SPI 3
+
+#endif
diff --git a/arch/microblaze/include/asm/u-boot.h b/arch/microblaze/include/asm/u-boot.h
index 31b014c..ab3f232 100644
--- a/arch/microblaze/include/asm/u-boot.h
+++ b/arch/microblaze/include/asm/u-boot.h
@@ -25,6 +25,7 @@
unsigned long bi_sramstart; /* start of SRAM memory */
unsigned long bi_sramsize; /* size of SRAM memory */
unsigned int bi_baudrate; /* Console Baudrate */
+ ulong bi_boot_params; /* where this board expects params */
} bd_t;
/* For image.h:image_check_target_arch() */
diff --git a/arch/microblaze/lib/board.c b/arch/microblaze/lib/board.c
index d22aa85..59956a8 100644
--- a/arch/microblaze/lib/board.c
+++ b/arch/microblaze/lib/board.c
@@ -50,10 +50,14 @@
fdtdec_check_fdt,
#endif
serial_init,
+#ifndef CONFIG_SPL_BUILD
console_init_f,
+#endif
display_banner,
+#ifndef CONFIG_SPL_BUILD
interrupts_init,
timer_init,
+#endif
NULL,
};
@@ -66,7 +70,7 @@
gd = (gd_t *)(CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_GBL_DATA_OFFSET);
bd = (bd_t *)(CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_GBL_DATA_OFFSET
- GENERATED_BD_INFO_SIZE);
-#if defined(CONFIG_CMD_FLASH)
+#if defined(CONFIG_CMD_FLASH) && !defined(CONFIG_SPL_BUILD)
ulong flash_size = 0;
#endif
asm ("nop"); /* FIXME gd is not initialize - wait */
@@ -88,9 +92,12 @@
/* FDT is at end of image */
gd->fdt_blob = (void *)__end;
#endif
+
+#ifndef CONFIG_SPL_BUILD
/* Allow the early environment to override the fdt address */
gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
(uintptr_t)gd->fdt_blob);
+#endif
/*
* The Malloc area is immediately below the monitor copy in DRAM
@@ -110,6 +117,7 @@
hang();
}
+#ifndef CONFIG_SPL_BUILD
#ifdef CONFIG_OF_CONTROL
/* For now, put this check after the console is ready */
if (fdtdec_prepare_fdt())
@@ -190,4 +198,5 @@
WATCHDOG_RESET();
main_loop();
}
+#endif /* CONFIG_SPL_BUILD */
}
diff --git a/include/configs/microblaze-generic.h b/include/configs/microblaze-generic.h
index 35e5a4a..486787e 100644
--- a/include/configs/microblaze-generic.h
+++ b/include/configs/microblaze-generic.h
@@ -447,4 +447,64 @@
# undef CONFIG_PHYLIB
#endif
+/* SPL part */
+#define CONFIG_SPL
+#define CONFIG_CMD_SPL
+#define CONFIG_SPL_FRAMEWORK
+#define CONFIG_SPL_LIBCOMMON_SUPPORT
+#define CONFIG_SPL_LIBGENERIC_SUPPORT
+#define CONFIG_SPL_SERIAL_SUPPORT
+#define CONFIG_SPL_BOARD_INIT
+
+#define CONFIG_SPL_LDSCRIPT "arch/microblaze/cpu/u-boot-spl.lds"
+
+#define CONFIG_SPL_RAM_DEVICE
+#define CONFIG_SPL_NOR_SUPPORT
+
+/* for booting directly linux */
+#define CONFIG_SPL_OS_BOOT
+
+#define CONFIG_SYS_OS_BASE (CONFIG_SYS_FLASH_BASE + \
+ 0x60000)
+#define CONFIG_SYS_FDT_BASE (CONFIG_SYS_FLASH_BASE + \
+ 0x40000)
+#define CONFIG_SYS_SPL_ARGS_ADDR (CONFIG_SYS_TEXT_BASE + \
+ 0x1000000)
+
+/* SP location before relocation, must use scratch RAM */
+/* BRAM start */
+#define CONFIG_SYS_INIT_RAM_ADDR 0x0
+/* BRAM size - will be generated */
+#define CONFIG_SYS_INIT_RAM_SIZE 0x10000
+/* Stack pointer prior relocation, must situated at on-chip RAM */
+#define CONFIG_SYS_SPL_MALLOC_END (CONFIG_SYS_INIT_RAM_ADDR + \
+ CONFIG_SYS_INIT_RAM_SIZE - \
+ GENERATED_GBL_DATA_SIZE)
+
+#define CONFIG_SYS_SPL_MALLOC_SIZE 0x100
+
+/*
+ * The main reason to do it in this way is that MALLOC_START
+ * can't be defined - common/spl/spl.c
+ */
+#if (CONFIG_SYS_SPL_MALLOC_SIZE != 0)
+# define CONFIG_SYS_SPL_MALLOC_START (CONFIG_SYS_SPL_MALLOC_END - \
+ CONFIG_SYS_SPL_MALLOC_SIZE)
+# define CONFIG_SPL_STACK_ADDR CONFIG_SYS_SPL_MALLOC_START
+#else
+# define CONFIG_SPL_STACK_ADDR CONFIG_SYS_SPL_MALLOC_END
+#endif
+
+/* Just for sure that there is a space for stack */
+#define CONFIG_SPL_STACK_SIZE 0x100
+
+#define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_FLASH_BASE
+#define CONFIG_SYS_UBOOT_START CONFIG_SYS_TEXT_BASE
+
+#define CONFIG_SPL_MAX_FOOTPRINT (CONFIG_SYS_INIT_RAM_SIZE - \
+ CONFIG_SYS_INIT_RAM_ADDR - \
+ GENERATED_GBL_DATA_SIZE - \
+ CONFIG_SYS_SPL_MALLOC_SIZE - \
+ CONFIG_SPL_STACK_SIZE)
+
#endif /* __CONFIG_H */