Hi Mauro,
On 09.01.20 18:28, Mauro Condarelli wrote:
I managed to brick my target.
Situation: I have a board with a paleolithic (1.1.3) version of u-boot. I had been testing by loading in ram from USB: usb reset; fatload usb 0 80010000 u-boot.bin; go 80010000 and everything was ok. I changed a few settings (both defconfigs are attached below) and tried "the real thing" Unfortunately reflashing the actual boot produced a brick. It does not utter a single byte.
Ugh. Too bad.
I will have to reflash the original using an external apparatus (which I don't have here, so I'll have to take target to another location, probably tomorrow morning), but question is: how do I debug such a situation?
To debug very early problems, I suggest to use the DEBUG_UART interface in U-Boot. I also used it quite a lot before - also on this platform.
Please see:
include/debug_uart.h:
debug_uart_init(); printhex8(0x01); ...
When using UART2 on the MT7628 please make sure to configure the pin mux before using the debug uart. Otherwise nothing will get printed.
BTW: This might also be a problem on your board, if you use UART2 and the muxing is not done no output will occur.
What could I have done so wrong?
As You can see I changed only a few settings:
--- configs/vocore_vocore2-ram_defconfig 2020-01-09 16:11:12.568096050 +0100 +++ configs/vocore_vocore2_defconfig 2020-01-09 16:07:10.528267378 +0100 @@ -1,9 +1,12 @@ CONFIG_MIPS=y -CONFIG_SYS_TEXT_BASE=0x80010000 +CONFIG_SYS_TEXT_BASE=0x9c000000 CONFIG_ENV_SIZE=0x00001000 CONFIG_NR_DRAM_BANKS=1 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_ENV_VARS_UBOOT_CONFIG=y CONFIG_SYS_BOOT_GET_CMDLINE=y ... in a way that's very similar to boards based on the same SoC (linkit-smart-7688 and gardena-smart-gateway-mt7688).
In the ancient u-boot I had to remove a header from the RAM version, but this was not needed with current u-boot.
Did I forget some step?
Did you never program U-Boot into SPI NOR before on your VoCore2? Which binary did you program? How do the fist line look like? Here my output:
$ hexdump -n 256 u-boot.bin 0000000 013f 1000 4800 4080 0000 0000 0000 0000 0000010 0000 0000 0000 0000 0000 0000 0000 0000 * 0000100
Thanks, Stefan