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|
NXP i.MX8MQ EVK Evaluation Board
================================
Board comes with:
* 3GiB of LPDDR4 RAM
* 16GiB eMMC
Not including booting via serial, the device can boot from either SD or eMMC.
Downloading DDR PHY Firmware
----------------------------
As a part of DDR intialization routine NXP i.MX8MQ EVK requires and
uses several binary firmware blobs that are distributed under a
separate EULA and cannot be included in Barebox. In order to obtain
them do the following::
wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-7.2.bin
chmod +x firmware-imx-7.2.bin
./firmware-imx-7.2.bin
Executing that file should produce a EULA acceptance dialog as well as
result in the following files:
- lpddr4_pmu_train_1d_dmem.bin
- lpddr4_pmu_train_1d_imem.bin
- lpddr4_pmu_train_2d_dmem.bin
- lpddr4_pmu_train_2d_imem.bin
As a last step of this process those files need to be placed in
"firmware/imx/"::
for f in lpddr4_pmu_train_1d_dmem.bin \
lpddr4_pmu_train_1d_imem.bin \
lpddr4_pmu_train_2d_dmem.bin \
lpddr4_pmu_train_2d_imem.bin; \
do \
cp firmware-imx-7.2/firmware/ddr/synopsys/${f} \
firmware/imx/${f}; \
done
DDR Configuration Code
======================
The following two files:
- ddr_init.c
- ddrphy_train.c
were obtained by running i.MX 8M DDR Tool that can be found here:
https://community.nxp.com/docs/DOC-340179
Only minimal amount of necessary changes were made to those files.
All of the "impedance matching" code is located in "ddr.h".
Build Barebox
=============
make imx_v8_defconfig
make
Boot Configuration
==================
The NXM i.MX8MQ EVK Evaluation Board has two switches responsible for
configuring bootsource/boot mode:
* SW802 for selecting appropriate BMOD
* SW801 for selecting appropriate boot medium
In order to select internal boot set SW802 as follows::
+-----+
| |
| O | | <--- on = high level
| | | |
| | O | <--- off = low level
| |
| 1 2 |
+-----+
Bootsource is the internal eMMC::
+---------+
| |
| | | O | |
| | | | | | <---- eMMC
| O O O O |
| |
| 1 2 3 4 |
+---------+
Bootsource is the SD2 slot::
+---------+
| |
| O O | | |
| | | | | | <---- SD2
| | | O O |
| |
| 1 2 3 4 |
+---------+
Serial boot SW802 setting needed for i.MX8 DDR Tool is as follows::
+-----+
| |
| | O | <--- on = high level
| | | |
| O | | <--- off = low level
| |
| 1 2 |
+-----+
|
