[U-Boot] Raspberry PI Compute Module - UART Issue

[Belisko Marek]

Hi Lee,

On Tue, Sep 17, 2019 at 4:45 PM Lee Annamalai <lannamalai at geoint.africa> wrote:
>
> Hi
>
> I am using a Raspberry PI compute module (CM 3+), which seems to be running U-Boot - U-Boot 2019.04-dirty (Aug 21 2019 - 14:41:54 +0000)
>
> The CM3+ is communicating on the UART at boot, before the Kernel loads:
>
> U-Boot 2019.04-dirty (Aug 21 2019 - 14:41:54 +0000)
>
> DRAM:  948 MiB
> RPI Compute Module 3 (0xa220a0)
> MMC:   mmc at 7e202000: 0, sdhci at 7e300000: 1
> Loading Environment from FAT... WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
> WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_OK
> In:    serial
> Out:   serial
>     1     0
> WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
> WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
> switch to partitions #0, OK
> mmc0(part 0) is current device
> LOADBOOTENV
> Running uenvcmd ...
> ENVCMD
> 6697472 bytes read in 285 ms (22.4 MiB/s)
> 3647066 bytes read in 155 ms (22.4 MiB/s)
> 42064 bytes read in 12 ms (3.3 MiB/s)
> Kernel image @ 0x200000 [ 0x000000 - 0x663200 ]
> ## Flattened Device Tree blob at 02000000
>    Booting using the fdt blob at OK
>    Loa
> Starting kern
>
>
>
> I however have a serial device connected to the UART and it starts communicating on power on to the UART. This is causing the boot process to stop.
>
> I would like to find out how to stop U-BOOT from reading messages on the UART at boot?
Please try to set bootdelay to 0 or -1 (this will force not to read
for user input). I suggest to read in u-boot docs article about
autoboot (will give you some more background).
>
> Regards
> Lee Annamalai
> _______________________________________________
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> U-Boot at lists.denx.de
> https://lists.denx.de/listinfo/u-boot

BR,

marek

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