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arm: mvebu: Add runtime detection of UART (xmodem) boot-mode

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This patch adds runtime detection of the Marvell UART boot-mode (xmodem
protocol). If this boot-mode is detected, SPL will return to the
BootROM to continue the UART booting.

With this patch its now possible, to generate a U-Boot image that
can be booted either from the strapped boot-device (e.g. SPI NOR, MMC,
etc) or via the xmodem protocol from the UART. In the UART case,
the kwboot tool will dynamically insert the UART boot-device type
into the image. And also patch the load address in the header, so
that the mkimage header will be skipped (as its not expected by the
Marvell BootROM).

This simplifies the development for Armada XP / 38x based boards.
As no special images need to be generated by selecting the
MVEBU_BOOTROM_UARTBOOT Kconfig option.

Since the Kconfig option MVEBU_BOOTROM_UARTBOOT is not needed any
more, its now completely removed.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Dirk Eibach <dirk.eibach@gdsys.cc>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Kevin Smith <kevin.smith@elecsyscorp.com>
This commit is contained in:
Stefan Roese 2016-01-07 14:12:04 +01:00
parent a5f88877af
commit f4db6c976c
6 changed files with 36 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Makefile
View File

@ -915,18 +915,8 @@ MKIMAGEFLAGS_u-boot.pbl = -n $(srctree)/$(CONFIG_SYS_FSL_PBL_RCW:"%"=%) \
u-boot.img u-boot.kwb u-boot.pbl: u-boot.bin FORCE
$(call if_changed,mkimage)
# If the kwboot xmodem protocol is used, to boot U-Boot on the MVEBU
# SoC's, the SPL U-Boot returns to the BootROM after it completes
# the SDRAM setup. The BootROM expects no U-Boot header in the main
# U-Boot image. So we need to combine SPL and u-boot.bin instead of
# u-boot.img in this case.
ifdef CONFIG_MVEBU_BOOTROM_UARTBOOT
u-boot-spl.kwb: u-boot-dtb.bin spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)
else
u-boot-spl.kwb: u-boot-dtb.img spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)
endif
MKIMAGEFLAGS_u-boot-dtb.img = $(MKIMAGEFLAGS_u-boot.img)

10
arch/arm/mach-mvebu/Kconfig
View File

@ -48,14 +48,4 @@ config SYS_VENDOR
config SYS_SOC
default "mvebu"
config MVEBU_BOOTROM_UARTBOOT
bool "Use kwboot to boot via BootROM xmodem protocol"
help
This option provides support for booting via the Marvell
xmodem protocol, used by the kwboot tool.
Please don't forget to configure the boot device in
the board specific kwbimage.cfg file this way:
BOOT_FROM uart
endif

8
arch/arm/mach-mvebu/include/mach/soc.h
View File

@ -96,6 +96,12 @@
#define MVCPU_WIN_ENABLE CPU_WIN_ENABLE
#define MVCPU_WIN_DISABLE CPU_WIN_DISABLE
/* BootROM error register (also includes some status infos) */
#define CONFIG_BOOTROM_ERR_REG (MVEBU_REGISTER(0x182d0))
#define BOOTROM_ERR_MODE_OFFS 28
#define BOOTROM_ERR_MODE_MASK (0xf << BOOTROM_ERR_MODE_OFFS)
#define BOOTROM_ERR_MODE_UART 0x6
#if defined(CONFIG_ARMADA_38X)
/* SAR values for Armada 38x */
#define CONFIG_SAR_REG (MVEBU_REGISTER(0x18600))
@ -106,7 +112,7 @@
#define SAR_BOOT_DEVICE_MASK (0x1f << SAR_BOOT_DEVICE_OFFS)
#define BOOT_DEV_SEL_OFFS 4
#define BOOT_DEV_SEL_MASK (0x1f << BOOT_DEV_SEL_OFFS)
#define BOOT_DEV_SEL_MASK (0x3f << BOOT_DEV_SEL_OFFS)
#define BOOT_FROM_UART 0x28
#define BOOT_FROM_SPI 0x32

6
arch/arm/mach-mvebu/lowlevel_spl.S
View File

@ -5,7 +5,6 @@
#include <config.h>
#include <linux/linkage.h>
#ifdef CONFIG_MVEBU_BOOTROM_UARTBOOT
ENTRY(save_boot_params)
stmfd sp!, {r0 - r12, lr} /* @ save registers on stack */
ldr r12, =CONFIG_SPL_BOOTROM_SAVE
@ -19,11 +18,6 @@ ENTRY(return_to_bootrom)
mov r0, #0x0 /* @ return value: 0x0 NO_ERR */
ldmfd sp!, {r0 - r12, pc} /* @ restore regs and return */
ENDPROC(return_to_bootrom)
#else
ENTRY(save_boot_params)
b save_boot_params_ret
ENDPROC(save_boot_params)
#endif
/*
* cache_inv - invalidate Cache line

20
arch/arm/mach-mvebu/spl.c
View File

@ -20,8 +20,23 @@ static u32 get_boot_device(void)
u32 val;
u32 boot_device;
/*
* First check, if UART boot-mode is active. This can only
* be done, via the bootrom error register. Here the
* MSB marks if the UART mode is active.
*/
val = readl(CONFIG_BOOTROM_ERR_REG);
boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
if (boot_device == BOOTROM_ERR_MODE_UART)
return BOOT_DEVICE_UART;
/*
* Now check the SAR register for the strapped boot-device
*/
val = readl(CONFIG_SAR_REG); /* SAR - Sample At Reset */
boot_device = (val & BOOT_DEV_SEL_MASK) >> BOOT_DEV_SEL_OFFS;
debug("SAR_REG=0x%08x boot_device=0x%x\n", val, boot_device);
switch (boot_device) {
#ifdef CONFIG_SPL_MMC_SUPPORT
case BOOT_FROM_MMC:
@ -90,7 +105,6 @@ void board_init_f(ulong dummy)
/* Setup DDR */
ddr3_init();
#ifdef CONFIG_MVEBU_BOOTROM_UARTBOOT
/*
* Return to the BootROM to continue the Marvell xmodem
* UART boot protocol. As initiated by the kwboot tool.
@ -102,6 +116,6 @@ void board_init_f(ulong dummy)
* need to return to the BootROM to enable this xmodem
* UART download.
*/
return_to_bootrom();
#endif
if (get_boot_device() == BOOT_DEVICE_UART)
return_to_bootrom();
}

14
tools/kwboot.c
View File

@ -9,10 +9,14 @@
* 2008. Chapter 24.2 "BootROM Firmware".
*/
#include "kwbimage.h"
#include "mkimage.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <image.h>
#include <libgen.h>
#include <fcntl.h>
#include <errno.h>
@ -22,8 +26,6 @@
#include <sys/mman.h>
#include <sys/stat.h>
#include "kwbimage.h"
#ifdef __GNUC__
#define PACKED __attribute((packed))
#else
@ -652,6 +654,14 @@ kwboot_img_patch_hdr(void *img, size_t size)
hdr->blockid = IBR_HDR_UART_ID;
/*
* Subtract mkimage header size from destination address
* as this header is not expected by the Marvell BootROM.
* This way, the execution address is identical to the
* one the image is compiled for (TEXT_BASE).
*/
hdr->destaddr = hdr->destaddr - sizeof(struct image_header);
if (image_ver == 0) {
struct main_hdr_v0 *hdr_v0 = img;