Re: [U-Boot] [PATCH 1/1] Set VLD04 output to 2.8V in PMIC initialization.

[mind entropy]

On Tue, Jun 27, 2017 at 10:54 PM, Fabio Estevam  wrote:

> Hi Gautam,
>
> On Wed, Jun 21, 2017 at 1:18 PM, Gautam Bhat 
> wrote:
> > This change sets the VLDO4 settings output to 2.8V in PMIC
> > initialization so that the MIPI DSI and MIPI CSI input voltage
> > is 2.8V as per the schematics.
>
> As we do not have MIPI DSI / MIPI CSI support in U-Boot, it is
> preferable to let the kernel configure the regulator.
>
> You can do this is the device tree like this:
>
> diff --git a/arch/arm/boot/dts/imx7d-sdb.dts
> b/arch/arm/boot/dts/imx7d-sdb.dts
> index 54c4540..923aa755 100644
> --- a/arch/arm/boot/dts/imx7d-sdb.dts
> +++ b/arch/arm/boot/dts/imx7d-sdb.dts
> @@ -285,8 +285,8 @@
> };
>
> vgen6_reg: vldo4 {
> -   regulator-min-microvolt = <180>;
> -   regulator-max-microvolt = <330>;
> +   regulator-min-microvolt = <280>;
> +   regulator-max-microvolt = <280>;
> regulator-always-on;
> };
> };
>
> Regards,
>
> Fabio Estevam
>

​Hi Fabio,

The patch for the kernel was supposed to be next. Should I send the kernel
patch to mainline or some place else?

Coming to u-boot, the fact that even if there is no MIPI DSI/MIPI CSI
support the voltage would still be 3.3V in those rails. In my case I do not
attach the display after u-boot boots up. I keep the display attached and
sometimes I leave it in u-boot command line without going over to the
kernel. Since this is a development board this is often the case for many
developers and there may be chances of the display getting damaged.

Thanks,
Gautam.

​
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[U-Boot] uboot ERROR cannot umount.

[mind entropy]

Hi,
  I am setting up a nfs boot and I am getting a ***ERROR: Cannot umount.
How can I fix this?

Details:
bootcmd=nfs 0x3100 192.168.1.101:/nfs/rootfs/boot/uImage ; bootm
0x3100
bootargs=console=ttySAC0,38400 root=/dev/nfs nfsroot=192.168.1.101:/nfs/rootfs
rw ip=dhcp mini2440=5tb

My nfs exports file:

/nfs/rootfs
192.168.1.0/24(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)
/nfs/rootfs/boot
192.168.1.0/24(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)


Log:

MINI2440 # boot
dm9000 i/o: 0x2300, id: 0x9a46
DM9000: running in 16 bit mode
MAC: 08:08:11:18:12:27
File transfer via NFS from server 192.168.1.101; our IP address is
192.168.1.110
Filename
'/nfs/rootfs/boot/uImage'.
Load address: 0x3100
Loading: #
 #
 #
 #
 #
 #
 #*** ERROR: Cannot umount
## Booting kernel from Legacy Image at 3100 ...
   Image Name:   Linux-3.9.2-ptx-master


Thanks,
Gautam.
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