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
