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i.MX: Add provisions to boot from IRAM 

This commit add a very basic code to allow Barebox to be booted from
IRAM. Given that the amount of IRAM on most i.MX variants is
insufficient to contain a copy of Barebox with any reasonable degree
of functionality this code uses IRAM only as a temporary location and
eventually bootstraps from DRAM. But the presense of the intermediate
IRAM-only stage allows to add provisions to test the area of DRAM that
Barebox would be using to facilitate various testing scenarious.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andrey Smirnov 2015-05-06 12:32:05 -07:00 committed by Sascha Hauer
parent c66574342d
commit 903c9477a0
12 changed files with 317 additions and 59 deletions
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27
Documentation/boards/imx.rst
View File

@ -46,6 +46,33 @@ The images can also always be started second stage::
bootm /mnt/tftp/barebox-freescale-imx51-babbage.img
Internal Boot Mode Through Internal RAM(IRAM)
---------------------------------------
The Internal Boot Mode Through Internal RAM is supported on:
* i.MX51
As can be easily deduced from its name, the Internal Boot Mode Through
Internal RAM is just a variant of Internal Boot Mode so all of the
stated above still applies in this case. What it differs in is the following:
* Boot process is done in two stages(First stage binary can be
produced with ``imx_v7-xload_defconfig``)
* DCD of the first stage image is set such that the image is fetched
into an unoccupied area or IRAM
* First stage image once uncompressed and set up will look for a
second stage bootloader on the same media it booted from and start
it(see mach-imx/xload.c for more details)
* Second stage images are just regular i.MX boot images
Since on a typical i.MX SoC unused IRAM area is not enough to run
anything but a PBL this mode, due to its very limited usability,
serves only one purpose -- allow for a portion of a bootloader to be
executed without depending on DRAM to be functional. This peculiarity
of the mode can be used to implement various memory testing
scenarious.
USB Boot
^^^^^^^^

3
arch/arm/boards/freescale-mx51-babbage/Makefile
View File

@ -1,3 +1,6 @@
obj-y += board.o flash-header-imx51-babbage.dcd.o
extra-y += flash-header-imx51-babbage.dcd.S flash-header-imx51-babbage.dcd
lwl-y += lowlevel.o
obj-$(CONFIG_ARCH_IMX_XLOAD) += flash-header-imx51-babbage-xload.dcd.o
extra-$(CONFIG_ARCH_IMX_XLOAD) += flash-header-imx51-babbage-xload.dcd.S flash-header-imx51-babbage-xload.dcd

60
arch/arm/boards/freescale-mx51-babbage/board.c
View File

@ -169,3 +169,63 @@ static int imx51_babbage_init(void)
return 0;
}
coredevice_initcall(imx51_babbage_init);
#ifdef CONFIG_ARCH_IMX_XLOAD
static int imx51_babbage_xload_init_pinmux(void)
{
static const iomux_v3_cfg_t pinmux[] = {
/* (e)CSPI */
MX51_PAD_CSPI1_MOSI__ECSPI1_MOSI,
MX51_PAD_CSPI1_MISO__ECSPI1_MISO,
MX51_PAD_CSPI1_SCLK__ECSPI1_SCLK,
/* (e)CSPI chip select lines */
MX51_PAD_CSPI1_SS1__GPIO4_25,
/* eSDHC 1 */
MX51_PAD_SD1_CMD__SD1_CMD,
MX51_PAD_SD1_CLK__SD1_CLK,
MX51_PAD_SD1_DATA0__SD1_DATA0,
MX51_PAD_SD1_DATA1__SD1_DATA1,
MX51_PAD_SD1_DATA2__SD1_DATA2,
MX51_PAD_SD1_DATA3__SD1_DATA3,
};
mxc_iomux_v3_setup_multiple_pads(ARRAY_AND_SIZE(pinmux));
return 0;
}
coredevice_initcall(imx51_babbage_xload_init_pinmux);
static int imx51_babbage_xload_init_devices(void)
{
static int spi0_chipselects[] = {
IMX_GPIO_NR(4, 25),
};
static struct spi_imx_master spi0_pdata = {
.chipselect = spi0_chipselects,
.num_chipselect = ARRAY_SIZE(spi0_chipselects),
};
static const struct spi_board_info spi0_devices[] = {
{
.name = "mtd_dataflash",
.chip_select = 0,
.max_speed_hz = 25 * 1000 * 1000,
.bus_num = 0,
},
};
imx51_add_mmc0(NULL);
spi_register_board_info(ARRAY_AND_SIZE(spi0_devices));
imx51_add_spi0(&spi0_pdata);
return 0;
}
device_initcall(imx51_babbage_xload_init_devices);
#endif

58
arch/arm/boards/freescale-mx51-babbage/flash-header-common.imxcfg Normal file
View File

@ -0,0 +1,58 @@
soc imx51
dcdofs 0x400
wm 32 0x73fa88a0 0x00000200
wm 32 0x73fa850c 0x000020c5
wm 32 0x73fa8510 0x000020c5
wm 32 0x73fa883c 0x00000002
wm 32 0x73fa8848 0x00000002
wm 32 0x73fa84b8 0x000000e7
wm 32 0x73fa84bc 0x00000045
wm 32 0x73fa84c0 0x00000045
wm 32 0x73fa84c4 0x00000045
wm 32 0x73fa84c8 0x00000045
wm 32 0x73fa8820 0x00000000
wm 32 0x73fa84a4 0x00000003
wm 32 0x73fa84a8 0x00000003
wm 32 0x73fa84ac 0x000000e3
wm 32 0x73fa84b0 0x000000e3
wm 32 0x73fa84b4 0x000000e3
wm 32 0x73fa84cc 0x000000e3
wm 32 0x73fa84d0 0x000000e2
wm 32 0x73fa882c 0x00000004
wm 32 0x73fa88a4 0x00000004
wm 32 0x73fa88ac 0x00000004
wm 32 0x73fa88b8 0x00000004
wm 32 0x83fd9000 0x82a20000
wm 32 0x83fd9008 0x82a20000
wm 32 0x83fd9010 0x000ad0d0
wm 32 0x83fd9004 0x3f3584ab
wm 32 0x83fd900c 0x3f3584ab
wm 32 0x83fd9014 0x04008008
wm 32 0x83fd9014 0x0000801a
wm 32 0x83fd9014 0x0000801b
wm 32 0x83fd9014 0x00448019
wm 32 0x83fd9014 0x07328018
wm 32 0x83fd9014 0x04008008
wm 32 0x83fd9014 0x00008010
wm 32 0x83fd9014 0x00008010
wm 32 0x83fd9014 0x06328018
wm 32 0x83fd9014 0x03808019
wm 32 0x83fd9014 0x00408019
wm 32 0x83fd9014 0x00008000
wm 32 0x83fd9014 0x0400800c
wm 32 0x83fd9014 0x0000801e
wm 32 0x83fd9014 0x0000801f
wm 32 0x83fd9014 0x0000801d
wm 32 0x83fd9014 0x0732801c
wm 32 0x83fd9014 0x0400800c
wm 32 0x83fd9014 0x00008014
wm 32 0x83fd9014 0x00008014
wm 32 0x83fd9014 0x0632801c
wm 32 0x83fd9014 0x0380801d
wm 32 0x83fd9014 0x0040801d
wm 32 0x83fd9014 0x00008004
wm 32 0x83fd9000 0xb2a20000
wm 32 0x83fd9008 0xb2a20000
wm 32 0x83fd9010 0x000ad6d0
wm 32 0x83fd9034 0x90000000
wm 32 0x83fd9014 0x00000000

3
arch/arm/boards/freescale-mx51-babbage/flash-header-imx51-babbage-xload.imxcfg Normal file
View File

@ -0,0 +1,3 @@
loadaddr CONFIG_ARCH_IMX_UNUSED_IRAM_BASE
#include "flash-header-common.imxcfg"

60
arch/arm/boards/freescale-mx51-babbage/flash-header-imx51-babbage.imxcfg
View File

@ -1,59 +1,3 @@
loadaddr 0x90000000
soc imx51
dcdofs 0x400
wm 32 0x73fa88a0 0x00000200
wm 32 0x73fa850c 0x000020c5
wm 32 0x73fa8510 0x000020c5
wm 32 0x73fa883c 0x00000002
wm 32 0x73fa8848 0x00000002
wm 32 0x73fa84b8 0x000000e7
wm 32 0x73fa84bc 0x00000045
wm 32 0x73fa84c0 0x00000045
wm 32 0x73fa84c4 0x00000045
wm 32 0x73fa84c8 0x00000045
wm 32 0x73fa8820 0x00000000
wm 32 0x73fa84a4 0x00000003
wm 32 0x73fa84a8 0x00000003
wm 32 0x73fa84ac 0x000000e3
wm 32 0x73fa84b0 0x000000e3
wm 32 0x73fa84b4 0x000000e3
wm 32 0x73fa84cc 0x000000e3
wm 32 0x73fa84d0 0x000000e2
wm 32 0x73fa882c 0x00000004
wm 32 0x73fa88a4 0x00000004
wm 32 0x73fa88ac 0x00000004
wm 32 0x73fa88b8 0x00000004
wm 32 0x83fd9000 0x82a20000
wm 32 0x83fd9008 0x82a20000
wm 32 0x83fd9010 0x000ad0d0
wm 32 0x83fd9004 0x3f3584ab
wm 32 0x83fd900c 0x3f3584ab
wm 32 0x83fd9014 0x04008008
wm 32 0x83fd9014 0x0000801a
wm 32 0x83fd9014 0x0000801b
wm 32 0x83fd9014 0x00448019
wm 32 0x83fd9014 0x07328018
wm 32 0x83fd9014 0x04008008
wm 32 0x83fd9014 0x00008010
wm 32 0x83fd9014 0x00008010
wm 32 0x83fd9014 0x06328018
wm 32 0x83fd9014 0x03808019
wm 32 0x83fd9014 0x00408019
wm 32 0x83fd9014 0x00008000
wm 32 0x83fd9014 0x0400800c
wm 32 0x83fd9014 0x0000801e
wm 32 0x83fd9014 0x0000801f
wm 32 0x83fd9014 0x0000801d
wm 32 0x83fd9014 0x0732801c
wm 32 0x83fd9014 0x0400800c
wm 32 0x83fd9014 0x00008014
wm 32 0x83fd9014 0x00008014
wm 32 0x83fd9014 0x0632801c
wm 32 0x83fd9014 0x0380801d
wm 32 0x83fd9014 0x0040801d
wm 32 0x83fd9014 0x00008004
wm 32 0x83fd9000 0xb2a20000
wm 32 0x83fd9008 0xb2a20000
wm 32 0x83fd9010 0x000ad6d0
wm 32 0x83fd9034 0x90000000
wm 32 0x83fd9014 0x00000000
#include "flash-header-common.imxcfg"

25
arch/arm/boards/freescale-mx51-babbage/lowlevel.c
View File

@ -3,6 +3,7 @@
#include <common.h>
#include <mach/esdctl.h>
#include <mach/generic.h>
#include <asm/cache.h>
#include <asm/barebox-arm-head.h>
#include <asm/barebox-arm.h>
@ -53,3 +54,27 @@ ENTRY_FUNCTION(start_imx51_babbage, r0, r1, r2)
imx51_barebox_entry(fdt);
}
static noinline void babbage_entry(void)
{
arm_early_mmu_cache_invalidate();
relocate_to_current_adr();
setup_c();
puts_ll("lowlevel init done\n");
imx51_barebox_entry(NULL);
}
ENTRY_FUNCTION(start_imx51_babbage_xload, r0, r1, r2)
{
imx5_cpu_lowlevel_init();
if (IS_ENABLED(CONFIG_DEBUG_LL))
setup_uart();
arm_setup_stack(0x20000000 - 16);
babbage_entry();
}

52
arch/arm/configs/imx_v7-xload_defconfig Normal file
View File

@ -0,0 +1,52 @@
CONFIG_ARCH_IMX=y
CONFIG_ARCH_IMX_IMXIMAGE=y
CONFIG_ARCH_IMX_XLOAD=y
CONFIG_ARCH_IMX51=y
CONFIG_IMX_MULTI_BOARDS=y
CONFIG_MACH_FREESCALE_MX51_PDK=y
CONFIG_THUMB2_BAREBOX=y
# CONFIG_CMD_ARM_CPUINFO is not set
CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS=y
CONFIG_MMU=y
CONFIG_TEXT_BASE=0x0
CONFIG_MALLOC_SIZE=0x0
CONFIG_MALLOC_DUMMY=y
CONFIG_RELOCATABLE=y
CONFIG_BAUDRATE=115200
CONFIG_SHELL_NONE=y
CONFIG_DEBUG_LL=y
CONFIG_DEBUG_IMX51_UART=y
CONFIG_DEBUG_IMX_UART_PORT=1
CONFIG_HAS_DEBUG_LL=y
CONFIG_MTD=y
# CONFIG_MTD_WRITE is not set
CONFIG_MTD_DATAFLASH=y
# CONFIG_ERRNO_MESSAGES is not set
# CONFIG_TIMESTAMP is not set
# CONFIG_DEFAULT_ENVIRONMENT is not set
CONFIG_DRIVER_SERIAL_IMX=y
CONFIG_MCI=y
CONFIG_MCI_STARTUP=y
# CONFIG_MCI_WRITE is not set
CONFIG_MCI_IMX_ESDHC=y
CONFIG_EEPROM_AT25=y
CONFIG_WATCHDOG_IMX_RESET_SOURCE=y
CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_IMX=y
# CONFIG_FS_RAMFS is not set
# CONFIG_FS_DEVFS is not set
CONFIG_FS_FAT=y
CONFIG_BOOTSTRAP=y
CONFIG_BOOTSTRAP_DISK=y
CONFIG_BOOTSTRAP_DEVFS=y

15
arch/arm/mach-imx/Kconfig
View File

@ -68,6 +68,21 @@ config ARCH_IMX_IMXIMAGE
help
if enabled the imx-image tool is compiled
config ARCH_IMX_XLOAD
bool
depends on ARCH_IMX51
prompt "Build preloader image"
config ARCH_IMX_UNUSED_IRAM_BASE
hex
depends on ARCH_IMX_XLOAD
default 0x1ffe2000 if ARCH_IMX51
config ARCH_IMX_UNUSED_IRAM_SIZE
hex
depends on ARCH_IMX_XLOAD
default 0x16000 if ARCH_IMX51
choice
depends on ARCH_IMX_INTERNAL_BOOT
prompt "Internal boot source"

1
arch/arm/mach-imx/Makefile
View File

@ -12,6 +12,7 @@ pbl-$(CONFIG_ARCH_IMX53) += imx53.o imx5.o esdctl-v4.o
obj-$(CONFIG_ARCH_IMX6) += imx6.o usb-imx6.o clk-imx6.o
lwl-$(CONFIG_ARCH_IMX6) += imx6-mmdc.o
obj-$(CONFIG_ARCH_IMX6SX) += clk-imx6sx.o
obj-$(CONFIG_ARCH_IMX_XLOAD) += xload.o
obj-$(CONFIG_IMX_IIM) += iim.o
obj-$(CONFIG_IMX_OCOTP) += ocotp.o
obj-$(CONFIG_NAND_IMX) += nand.o

52
arch/arm/mach-imx/xload.c Normal file
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@ -0,0 +1,52 @@
#include <bootsource.h>
#include <bootstrap.h>
#include <common.h>
#include <malloc.h>
#include <init.h>
#include <envfs.h>
#include <linux/sizes.h>
#include <fs.h>
#include <io.h>
#include <linux/clkdev.h>
#include <linux/stat.h>
#include <linux/clk.h>
#include <mach/devices-imx51.h>
static __noreturn int imx_xload(void)
{
enum bootsource bootsource = bootsource_get();
void *buf;
switch (bootsource) {
case BOOTSOURCE_MMC:
pr_info("booting from MMC\n");
buf = bootstrap_read_disk("disk0.0", "fat");
break;
case BOOTSOURCE_SPI:
pr_info("booting from SPI\n");
buf = bootstrap_read_devfs("dataflash0", false,
SZ_256K, SZ_1M, SZ_1M);
break;
default:
pr_err("unknown bootsource %d\n", bootsource);
hang();
}
if (!buf) {
pr_err("failed to load barebox.bin\n");
hang();
}
bootstrap_boot(buf, 0);
hang();
}
static int imx_devices_init(void)
{
barebox_main = imx_xload;
return 0;
}
coredevice_initcall(imx_devices_init);

20
images/Makefile.imx
View File

@ -4,8 +4,15 @@
# %.imximg - convert into i.MX image
# ----------------------------------------------------------------
ifdef CONFIG_ARCH_IMX_XLOAD
$(obj)/%.imximg: $(obj)/% FORCE
$(call cmd,check_file_size,$<,$(CONFIG_ARCH_IMX_UNUSED_IRAM_SIZE))
$(call if_changed,imx_image)
else
$(obj)/%.imximg: $(obj)/% FORCE
$(call if_changed,imx_image)
endif
# ----------------------- i.MX25 based boards ---------------------------
pblx-$(CONFIG_MACH_TX25) += start_imx25_karo_tx25
@ -29,7 +36,18 @@ image-$(CONFIG_MACH_PCM038) += barebox-phytec-phycore-imx27.img
pblx-$(CONFIG_MACH_FREESCALE_MX51_PDK) += start_imx51_babbage
CFG_start_imx51_babbage.pblx.imximg = $(board)/freescale-mx51-babbage/flash-header-imx51-babbage.imxcfg
FILE_barebox-freescale-imx51-babbage.img = start_imx51_babbage.pblx.imximg
image-$(CONFIG_MACH_FREESCALE_MX51_PDK) += barebox-freescale-imx51-babbage.img
imx-barebox-$(CONFIG_MACH_FREESCALE_MX51_PDK) += barebox-freescale-imx51-babbage.img
pblx-$(CONFIG_MACH_FREESCALE_MX51_PDK) += start_imx51_babbage_xload
CFG_start_imx51_babbage_xload.pblx.imximg = $(board)/freescale-mx51-babbage/flash-header-imx51-babbage-xload.imxcfg
FILE_barebox-freescale-imx51-babbage-xload.img = start_imx51_babbage_xload.pblx.imximg
imx-xload-$(CONFIG_MACH_FREESCALE_MX51_PDK) += barebox-freescale-imx51-babbage-xload.img
ifdef CONFIG_ARCH_IMX_XLOAD
image-y += $(imx-xload-y)
else
image-y += $(imx-barebox-y)
endif
pblx-$(CONFIG_MACH_EFIKA_MX_SMARTBOOK) += start_imx51_genesi_efikasb
CFG_start_imx51_genesi_efikasb.pblx.imximg = $(board)/efika-mx-smartbook/flash-header-imx51-genesi-efikasb.imxcfg