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omap-common: SYS_BOOT-based fallback boot device selection for peripheral boot 

OMAP devices might boot from peripheral devices, such as UART or USB.
When that happens, the U-Boot SPL tries to boot the next stage (complete U-Boot)
from that peripheral device, but in most cases, this is not a valid boot device.

This introduces a fallback option that reads the SYS_BOOT pins, that are used by
the bootrom to determine which device to boot from. It is intended for the
SYS_BOOT value to be interpreted in the memory-preferred scheme, so that the
U-Boot SPL can load the next stage from a valid location.

Practically, this options allows loading the U-Boot SPL through USB and have it
load the next stage according to the memory device selected by SYS_BOOT instead
of stalling.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
This commit is contained in:
Paul Kocialkowski 2015-07-15 16:02:23 +02:00 committed by Tom Rini
parent 2cb81b6bcd
commit ed19bdaea3
2 changed files with 49 additions and 7 deletions
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52
arch/arm/cpu/armv7/omap-common/boot-common.c
View File

@ -21,6 +21,11 @@
DECLARE_GLOBAL_DATA_PTR;
__weak u32 omap_sys_boot_device(void)
{
return BOOT_DEVICE_NONE;
}
void save_omap_boot_params(void)
{
u32 boot_params = *((u32 *)OMAP_SRAM_SCRATCH_BOOT_PARAMS);
@ -34,9 +39,10 @@ void save_omap_boot_params(void)
omap_boot_params = (struct omap_boot_parameters *)boot_params;
/* Boot device */
boot_device = omap_boot_params->boot_device;
boot_mode = MMCSD_MODE_UNDEFINED;
/* Boot device */
#ifdef BOOT_DEVICE_NAND_I2C
/*
@ -58,16 +64,39 @@ void save_omap_boot_params(void)
if (boot_device == BOOT_DEVICE_QSPI_4)
boot_device = BOOT_DEVICE_SPI;
#endif
#if (defined(BOOT_DEVICE_UART) && !defined(CONFIG_SPL_YMODEM_SUPPORT)) || \
(defined(BOOT_DEVICE_USB) && !defined(CONFIG_SPL_USB_SUPPORT)) || \
(defined(BOOT_DEVICE_USBETH) && !defined(CONFIG_SPL_USBETH_SUPPORT))
/*
* When booting from peripheral booting, the boot device is not usable
* as-is (unless there is support for it), so the boot device is instead
* figured out using the SYS_BOOT pins.
*/
switch (boot_device) {
#ifdef BOOT_DEVICE_UART
case BOOT_DEVICE_UART:
#endif
#ifdef BOOT_DEVICE_USB
case BOOT_DEVICE_USB:
#endif
boot_device = omap_sys_boot_device();
/* MMC raw mode will fallback to FS mode. */
if ((boot_device >= MMC_BOOT_DEVICES_START) &&
(boot_device <= MMC_BOOT_DEVICES_END))
boot_mode = MMCSD_MODE_RAW;
break;
}
#endif
gd->arch.omap_boot_device = boot_device;
/* Boot mode */
boot_mode = MMCSD_MODE_UNDEFINED;
#ifdef CONFIG_OMAP34XX
if ((boot_device >= MMC_BOOT_DEVICES_START) &&
(boot_device <= MMC_BOOT_DEVICES_END)) {
#ifdef CONFIG_OMAP34XX
switch (boot_device) {
case BOOT_DEVICE_MMC1:
boot_mode = MMCSD_MODE_FS;
@ -76,7 +105,16 @@ void save_omap_boot_params(void)
boot_mode = MMCSD_MODE_RAW;
break;
}
}
#else
/*
* If the boot device was dynamically changed and doesn't match what
* the bootrom initially booted, we cannot use the boot device
* descriptor to figure out the boot mode.
*/
if ((boot_device == omap_boot_params->boot_device) &&
(boot_device >= MMC_BOOT_DEVICES_START) &&
(boot_device <= MMC_BOOT_DEVICES_END)) {
boot_params = omap_boot_params->boot_device_descriptor;
if ((boot_params < NON_SECURE_SRAM_START) ||
(boot_params > NON_SECURE_SRAM_END))
@ -92,12 +130,12 @@ void save_omap_boot_params(void)
if (boot_mode != MMCSD_MODE_FS &&
boot_mode != MMCSD_MODE_RAW)
#ifdef CONFIG_SUPPORT_EMMC_BOOT
boot_mode = MMCSD_MODE_EMMCBOOT
boot_mode = MMCSD_MODE_EMMCBOOT;
#else
boot_mode = MMCSD_MODE_UNDEFINED;
#endif
#endif
}
#endif
gd->arch.omap_boot_mode = boot_mode;

4
arch/arm/include/asm/omap_common.h
View File

@ -697,4 +697,8 @@ static inline u8 is_dra72x(void)
#define CH_FLAGS_CHFLASH (1 << 2)
#define CH_FLAGS_CHMMCSD (1 << 3)
#ifndef __ASSEMBLY__
u32 omap_sys_boot_device(void);
#endif
#endif /* _OMAP_COMMON_H_ */