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 --- arch/arm/cpu/armv7/omap-common/boot-common.c | 52 ++++++++++++++++++++++++---- arch/arm/include/asm/omap_common.h | 4 +++ 2 files changed, 49 insertions(+), 7 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap-common/boot-common.c b/arch/arm/cpu/armv7/omap-common/boot-common.c index f2a25dc..5ec46fa 100644 --- a/arch/arm/cpu/armv7/omap-common/boot-common.c +++ b/arch/arm/cpu/armv7/omap-common/boot-common.c @@ -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;
diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h index 084ea68..056affc 100644 --- a/arch/arm/include/asm/omap_common.h +++ b/arch/arm/include/asm/omap_common.h @@ -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_ */