How to debug HW startup?

[Mauro Condarelli]

Hi Stefan,

On 1/13/20 7:53 AM, Stefan Roese wrote:
> Hi Mauro,
>
> On 11.01.20 20:00, Mauro Condarelli wrote:
>> I managed to find ONE of the reasons why my ROM build didn't run:
>> I forgot to enable `CONFIG_BOARD_EARLY_INIT_F=y`.
>
> I see. This explains of course, why your board does not boot without
> any "preloader".
>
>> I wanted, nonetheless, be prepared for further mishaps, but
>> I have some other problems (see below).
>
> Are these issues now fixed? I scanned the discussion about the DEBUG
> UART on the list. Is this working for you now or do you have any other
> issues still? Did you successfully boot your new U-Boot from SPI NOR?
Yes and no :(

I fixed my RAM-based problems, but booting from SPI NOR still refuses to
utter a single byte.
I do attach  my defconfigs and my board.c for your reading pleasure (in
case you have troubles getting asleep they should provide a good cure).

I also added a couple of printouts in drivers/pinctrl/pinctrl-uclass.c
and it
turns out system tries to setup pins for uart2, but fails (maybe because
pinctrl at 60 is not yet setup correctly?).
This is the output I get from RAM-based u-boot:

<debug_uart> board_debug_uart_init():
board_early_init_f():
pinctrl_select_state_full('palmbus at 10000000', 'default'):
pinctrl_select_state_full('uart2 at e00', 'default'):
pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19
pinctrl_select_state_full('clkctrl at 0x2c', 'default'):


U-Boot 2020.01-00370-g97a60844bd-dirty (Jan 13 2020 - 01:03:59 +0100)

CPU:   MT7628 Rev 1.2 - Boot from XTAL (3-Byte SPI Addr)
Model: VoCore2
DRAM:  128 MiB
pinctrl_select_state_full('palmbus at 10000000', 'default'):
pinctrl_select_state_full('pinctrl at 60', 'default'):
pinctrl_select_state_full('pin_state', 'default'):
pinctrl_select_state_full('uart2 at e00', 'default'):
pinctrl_select_state_full('uart2_pins', 'default'):
pinctrl_select_state_full('clkctrl at 0x2c', 'default'):
pinctrl_select_state_full('watchdog at 100', 'default'):
WDT:   Started with servicing (60s timeout)
board_early_init_r():
arch_early_init_r():
MMC:   pinctrl_select_state_full('mmc at 10130000', 'default'):
pinctrl_select_state_full('sd_iot_mode', 'default'):
pinctrl_select_state_full('clk48m at 0', 'default'):
pinctrl_select_state_full('mmc at 10130000', 'default'):
mmc at 10130000: 0
Loading Environment from FAT... *** Warning - bad CRC, using default
environment

In:    uart2 at e00
Out:   uart2 at e00
Err:   uart2 at e00
Model: VoCore2
arch_misc_init():
=>

ROM-based u-boot, as said, does not print *anything*, not even garbage.
I'm beginning to suspect I have some mishap with start address or similar.
I have absolutely no idea how to debug this without a JTAG probe (which
I don't have and would be non-trivial to get working; soldering required).

The only idea I currently have is to modify my "old" u-boot to do
initialization
and then jump to beginning of "new" u-boot.
If I can make it work in an automatic way I can try removing
initialization steps
till I find the "culprit".
Any better idea would be welcome, of course!

If I have to resort to that clumsy method, would be enough to put  "new"
in  SPI NOR (of course at an higher address, e.g.: 30000 as "old" is only
183272 bytes long) and jump to the first location?
I assume I will have to relocate CONFIG_SYS_TEXT_BASE=0xbc030000
Did I forget something?

> <snip>
>
>>> You might also want to give the new version / patches from Weijie
>>> a try. He added SPL support and a "cleaner" init code for this SoC.
>> I'm interested in giving it a spin (and help debugging on another HW,
>> if needed), but I would like to have a solid base from where to move,
>> changing too many things at once is rarely a good strategy ;)
>
> I fully agree.
I need to be able to start from SPI NOR, before I can commit to some
other task
 
> Thanks,
> Stefan
Many thanks
Mauro
-------------- next part --------------
CONFIG_MIPS=y
CONFIG_SYS_TEXT_BASE=0x9c000000
CONFIG_ENV_SIZE=0x00001000
CONFIG_NR_DRAM_BANKS=1
CONFIG_DEBUG_UART_BOARD_INIT=y
CONFIG_DEBUG_UART_BASE=0x10000e00
CONFIG_DEBUG_UART_CLOCK=40000000
CONFIG_ARCH_MTMIPS=y
CONFIG_BOARD_VOCORE2=y
CONFIG_BOOT_ROM=y
CONFIG_ONBOARD_DDR2_SIZE_1024MBIT=y
CONFIG_ONBOARD_DDR2_CHIP_WIDTH_16BIT=y
CONFIG_MIPS_BOOT_FDT=y
CONFIG_DEBUG_UART=y
CONFIG_ENV_VARS_UBOOT_CONFIG=y
CONFIG_SYS_BOOT_GET_CMDLINE=y
CONFIG_SYS_BOOT_GET_KBD=y
# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
CONFIG_USE_BOOTARGS=y
CONFIG_LOGLEVEL=8
CONFIG_VERSION_VARIABLE=y
CONFIG_DISPLAY_BOARDINFO_LATE=y
CONFIG_ARCH_EARLY_INIT_R=y
CONFIG_ARCH_MISC_INIT=y
CONFIG_BOARD_EARLY_INIT_F=y
CONFIG_BOARD_EARLY_INIT_R=y
CONFIG_HUSH_PARSER=y
# CONFIG_AUTOBOOT is not set
# CONFIG_BOOTM_NETBSD is not set
# CONFIG_BOOTM_PLAN9 is not set
# CONFIG_BOOTM_RTEMS is not set
# CONFIG_BOOTM_VXWORKS is not set
# CONFIG_CMD_XIMG is not set
CONFIG_CMD_MEMINFO=y
CONFIG_CMD_GPIO=y
CONFIG_RANDOM_UUID=y
# CONFIG_CMD_LOADB is not set
# CONFIG_CMD_LOADS is not set
CONFIG_CMD_MMC=y
CONFIG_CMD_MTD=y
CONFIG_CMD_PART=y
CONFIG_CMD_SPI=y
CONFIG_CMD_USB=y
CONFIG_CMD_WDT=y
CONFIG_CMD_FAT=y
CONFIG_CMD_FS_GENERIC=y
CONFIG_CMD_MTDPARTS=y
CONFIG_MTDIDS_DEFAULT="nor0=spi0.0"
CONFIG_MTDPARTS_DEFAULT="spi0.0:504k(u-boot),4k(env),4k(factory),2688k(kernel),-(filesystem)"
# CONFIG_ISO_PARTITION is not set
CONFIG_DEFAULT_DEVICE_TREE="vocore_vocore2"
CONFIG_ENV_IS_IN_FAT=y
CONFIG_ENV_FAT_INTERFACE="mmc"
CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
# CONFIG_NET is not set
# CONFIG_DM_DEVICE_REMOVE is not set
# CONFIG_INPUT is not set
CONFIG_LED=y
CONFIG_LED_BLINK=y
CONFIG_LED_GPIO=y
CONFIG_MMC=y
CONFIG_DM_MMC=y
# CONFIG_MMC_HW_PARTITIONING is not set
CONFIG_MMC_MTK=y
CONFIG_MTD=y
CONFIG_SPI_FLASH_SFDP_SUPPORT=y
CONFIG_SPI_FLASH_GIGADEVICE=y
CONFIG_SPI_FLASH_WINBOND=y
CONFIG_SPI_FLASH_MTD=y
# CONFIG_DM_ETH is not set
# CONFIG_RAM_ROCKCHIP_DEBUG is not set
CONFIG_SPECIFY_CONSOLE_INDEX=y
CONFIG_CONS_INDEX=3
CONFIG_DEBUG_UART_MTK=y
CONFIG_DEBUG_UART_SHIFT=2
CONFIG_DEBUG_UART_ANNOUNCE=y
CONFIG_SPI=y
CONFIG_MT7621_SPI=y
CONFIG_SYSRESET_SYSCON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_GENERIC=y
CONFIG_USB_STORAGE=y
CONFIG_WDT=y
CONFIG_WDT_MT7621=y
CONFIG_LZMA=y
CONFIG_LZO=y
-------------- next part --------------
CONFIG_MIPS=y
CONFIG_SYS_TEXT_BASE=0x80010000
CONFIG_ENV_SIZE=0x00001000
CONFIG_NR_DRAM_BANKS=1
CONFIG_DEBUG_UART_BOARD_INIT=y
CONFIG_DEBUG_UART_BASE=0x10000e00
CONFIG_DEBUG_UART_CLOCK=40000000
CONFIG_ARCH_MTMIPS=y
CONFIG_BOARD_VOCORE2=y
CONFIG_MIPS_BOOT_FDT=y
CONFIG_DEBUG_UART=y
CONFIG_ENV_VARS_UBOOT_CONFIG=y
CONFIG_SYS_BOOT_GET_CMDLINE=y
CONFIG_SYS_BOOT_GET_KBD=y
# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
CONFIG_USE_BOOTARGS=y
CONFIG_LOGLEVEL=8
CONFIG_VERSION_VARIABLE=y
CONFIG_DISPLAY_BOARDINFO_LATE=y
CONFIG_ARCH_EARLY_INIT_R=y
CONFIG_ARCH_MISC_INIT=y
CONFIG_BOARD_EARLY_INIT_F=y
CONFIG_BOARD_EARLY_INIT_R=y
CONFIG_HUSH_PARSER=y
# CONFIG_AUTOBOOT is not set
# CONFIG_BOOTM_NETBSD is not set
# CONFIG_BOOTM_PLAN9 is not set
# CONFIG_BOOTM_RTEMS is not set
# CONFIG_BOOTM_VXWORKS is not set
# CONFIG_CMD_XIMG is not set
CONFIG_CMD_MEMINFO=y
CONFIG_CMD_GPIO=y
CONFIG_RANDOM_UUID=y
# CONFIG_CMD_LOADB is not set
# CONFIG_CMD_LOADS is not set
CONFIG_CMD_MMC=y
CONFIG_CMD_MTD=y
CONFIG_CMD_PART=y
CONFIG_CMD_SPI=y
CONFIG_CMD_USB=y
CONFIG_CMD_WDT=y
CONFIG_CMD_FAT=y
CONFIG_CMD_FS_GENERIC=y
CONFIG_CMD_MTDPARTS=y
CONFIG_MTDIDS_DEFAULT="nor0=spi0.0"
CONFIG_MTDPARTS_DEFAULT="spi0.0:504k(u-boot),4k(env),4k(factory),2688k(kernel),-(filesystem)"
# CONFIG_ISO_PARTITION is not set
CONFIG_DEFAULT_DEVICE_TREE="vocore_vocore2"
CONFIG_ENV_IS_IN_FAT=y
CONFIG_ENV_FAT_INTERFACE="mmc"
CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
# CONFIG_NET is not set
# CONFIG_DM_DEVICE_REMOVE is not set
# CONFIG_INPUT is not set
CONFIG_LED=y
CONFIG_LED_BLINK=y
CONFIG_LED_GPIO=y
CONFIG_MMC=y
CONFIG_DM_MMC=y
# CONFIG_MMC_HW_PARTITIONING is not set
CONFIG_MMC_MTK=y
CONFIG_MTD=y
CONFIG_SPI_FLASH_SFDP_SUPPORT=y
CONFIG_SPI_FLASH_GIGADEVICE=y
CONFIG_SPI_FLASH_WINBOND=y
CONFIG_SPI_FLASH_MTD=y
# CONFIG_DM_ETH is not set
# CONFIG_RAM_ROCKCHIP_DEBUG is not set
CONFIG_SPECIFY_CONSOLE_INDEX=y
CONFIG_CONS_INDEX=3
CONFIG_DEBUG_UART_MTK=y
CONFIG_DEBUG_UART_SHIFT=2
CONFIG_DEBUG_UART_ANNOUNCE=y
CONFIG_SPI=y
CONFIG_MT7621_SPI=y
CONFIG_SYSRESET_SYSCON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_GENERIC=y
CONFIG_USB_STORAGE=y
CONFIG_WDT=y
CONFIG_WDT_MT7621=y
CONFIG_LZMA=y
CONFIG_LZO=y
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