[U-Boot] U-Boot

[Mariano Coromac]

I changed fdt_high but got the same result.
I wrote my device tree, added it into the makefile and copy the
sama5d2.config with my board name. I also got rid of all the unnecessary
stuff.
I'm now using the correct .dtb file (in arch/arm/boot/dts/)
My device tree stdout-path does point into my flexcom1 serial port.
Do you see something wrong?
            flx1: flexcom at f8038000 {
                atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_TWI>;
                status = "okay";

                uart5: serial at 200 {
                    compatible = "atmel,at91sam9260-usart";
                    reg = <0x200 0x200>;
                    interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
                    #address-cells = <1>;
                    #size-cells = <0>;
                    clocks = <&flx0_clk>;
                    pinctrl-names = "default";
                    pinctrl-0 = <&pinctrl_flx0_default>;
                    atmel,fifo-size = <16>;
                    status = "okay";
                };
            };
Here's a new log if it is of any use:
AT91Bootstrap 3.8.9-00026-gd7a52fb-dirty (mié feb 21 10:03:49 CST 2018)

SD/MMC: Image: Read file u-boot.bin to 0x26f00000
MMC: Specification Version 1.2
SD/MMC: Done to load image
<debug_uart> MMC:   sdio-host at a0000000: 0

** Unable to use mmc 0:1 for loading the env **
Using default environment

In:    serial at f8038200
Out:   serial at f8038200
Err:   serial at f8038200
stdin
stdout
stderr
Hit any key to stop autoboot:  0
reading p_a5_tab_reva.dtb
26135 bytes read in 18 ms (1.4 MiB/s)
reading zImage
2452336 bytes read in 198 ms (11.8 MiB/s)
## Current stack ends at 0x27b84588 *  kernel: cmdline image address =
0x22000000
## Flattened Device Tree blob at 21000000
   Booting using the fdt blob at 0x21000000
using: FDT
   Loading Device Tree to 27b79000, end 27b82616 ... OK
## Transferring control to Linux (at address 22000000)...

Starting kernel ...

As my understanding goes those are the only things I need, my device tree
and the linux image. I think my main problem is that I don't have the
console in my serial port, that's why it appears like it hangs but I'm not
so sure about that.
I also defined the following inside my config file:
CONFIG_DEBUG_UART_PHYS=0xf8038200
CONFIG_DEBUG_UART_VIRT=0xf7038200

Any help would be appreciated.


On Fri, Mar 2, 2018 at 11:58 AM, Nicolas Ferre <nicolas.ferre at microchip.com>
wrote:

> On 01/03/2018 at 20:55, Mariano Coromac wrote:
>
>> I found the problem. In my header file I was reading from eMMC device 1.
>> Not 0. That's why the operations with mmc worked in command line but did
>> not on startup.
>> Please correct me if I'm mistaken but I have a couple questions.
>> 1) Do I need a partition in my eMMC in order to boot the Linux kernel?
>> When I run "mmc part" it shows no partition at all.
>> 2) When U-Boot finishes compiling it generates a .dtb with the name of my
>> custom board. I need to write this file (alongside zImage) inside my eMMC
>> for my Linux Kernel to boot right?
>>
>
> Actually no: the .dtb from U-Boot is for U-Boot to use. For loading the
> Linux kernel, you must use the .dtb that is produced by the compilation of
> the kernel (in arch/arm/boot/dts/)
>
>
>
> When I try to boot the kernel it hangs in here:
>> => boot
>> reading p_a5_tab_reva.dtb
>> 13699 bytes read in 18 ms (743.2 KiB/s)
>> reading zImage
>> 3749624 bytes read in 298 ms (12 MiB/s)
>> ## Flattened Device Tree blob at 21000000
>>     Booting using the fdt blob at 0x21000000
>>     Loading Device Tree to 27b7d000, end 27b83582 ... OK
>>
>> Starting kernel ...
>>
>> What do you think of this? Perhaps is regarding the kernel itself or
>> maybe is a UBoot configuration?
>>
>
>
> --
> Nicolas Ferre
>



-- 
Mariano Coromac <https://gps.gt/>
I&D of Electronics Engineer
mcoromac at stsa.info
+502 41544712
www.gps.gt <http://facebook.com/startracksa>