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Subject: Re: [PATCH v11 33/56] Input: atmel_mxt_ts - delay enabling IRQ when
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To:     "Wang, Jiada" <jiada_wang@mentor.com>
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From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <2e41656c-e7e4-5dcb-1156-bcfcbc8ea595@gmail.com>
Date:   Sun, 17 May 2020 16:08:31 +0300
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17.05.2020 06:32, Wang, Jiada пишет:
> Hello Dmitry
> 
> On 2020/05/14 13:53, Dmitry Osipenko wrote:
>> 13.05.2020 08:07, Wang, Jiada пишет:
>>> Hello Dmitry
>>>
>>> On 2020/05/12 8:13, Dmitry Osipenko wrote:
>>>> 11.05.2020 05:05, Wang, Jiada пишет:
>>>>> Hello Dmitry
>>>>>
>>>>> Thanks for your comment and test,
>>>>>
>>>>> can you let me know which platform (board) you are using for test,
>>>>> and DTS changes if you have added any.
>>>>
>>>> That's this device-tree [1] without any extra changes.
>>>>
>>> I am using Samsung Chromebook Pro for testing,
>>> but obviously some of the use cases it can't cover.
>>>
>>> I also would like to test on same device you are using,
>>> would you please let me know how to boot Acer Iconia Tab A500
>>> with custom images. Are you booting Linux or Android on it?
>>
>> I'm using Ubuntu 20.04 on it at the moment. In order to boot custom
>> images you'll need at least to install a custom recovery, which will
>> allow to flash boot.img on eMMC storage.
>>
>> Ideally, you'll need to install an unlocked bootloader that will enable
>> Android's fastboot, and thus, allow to easily boot kernel zImage without
>> messing with flashing boot images.
>>
>> Could you please tell what is the current state of yours device: does it
>> have a stock Android installed? is it rooted? is custom recovery
>> installed?
>>
> Thanks for your information
> 
> By following instructions found in XDA forums,
> now I am able to install an unlocked bootloader,
> boot among primary kernel, recovery kernel or fastboot,
> an Android custom stock rom also has been installed

Awesome!

> Could you please let me know how to install local built ubuntu images

Sure, please follow these steps:

1. Download rootfs from
http://cdimage.ubuntu.com/ubuntu-base/releases/20.04/release/ubuntu-base-20.04-base-armhf.tar.gz

2. Extract it wherever you want yours root to be, like ExternalSD card
or eMMC /data partition or even NFS directory if you'll use usbnet.

3. Clone this kernel https://github.com/grate-driver/linux which is a
recent upstream linux-next + work-in-progress patches that haven't been
merged into upstream yet. For example DRM bridges and Tegra Partition
Table patches are under review now.

4. Select tegra_defconfig:

	ARCH=arm make tegra_defconfig

5. Compile kernel:

	ARCH=arm make

6. Append DTB to zImage:

	cat arch/arm/boot/zImage
arch/arm/boot/dts/tegra20-acer-a500-picasso.dtb > arch/arm/boot/zImage-dtb

7. Turn on A500 and select 'fastboot' option in the bootloader's menu.

8. Boot compiled kernel:

	fastboot -c "root=/dev/mmcblk2p8 gpt tegraboot=sdmmc" boot
arch/arm/boot/zImage-dtb

9. Grab touchscreen/WiFi/Bluetooth firmware files from
https://github.com/digetx/linux-firmware

10. Grab ALSA UCM rule from https://github.com/digetx/alsa-ucm-conf

11. Enjoy!

Please let me know you'll experience any problems, I'll be glad to help.