Update lpddr4 configuration and training using updated spreadsheet and
tools from NXP using data from previous spreadsheet and verified
toward datasheet:
- MX8M_Mini_LPDDR4_RPA_v22.xlsx
- mscale_ddr_tool_v3.31_setup.exe
The most relevant update is related to errata ERR050805:
"DRAM: Controller automatic derating logic may not work when
the LPDDR4 memory temperature is above 85 °C at initialization"
Other relevant fixes:
- DRAMTMG7 register: corrected calculation of T_CKPDX parameter
(equal to tCKCKEH for LPDDR4)
- RANKCTL register: corrected calculations for ODTLon and ODTLoff
to follow the JEDEC specification
- ADDRMAP7 register: added support for 17-row devices
As per errata ERR050805:
An issue exists with the automatic derating logic of the DDR
controller that only samples the LPDDR4 MR4 register when the
Temperature Update Flag (TUF) field (MR4[7] ) is 1’b1. If the
LPDDR4 memory is initialized and starts operation above 85 °C
(MR4[2:0] > 3’b011), the MR4 Temperature Update Flag (TUF) will
not be set. The DDR Controller will therefore not automatically
adjust the memory refresh rate or de-rate memory timings based
on the LPDDR4 memory temperature. This may cause the controller
incorrectly setting the refresh period, potentially cause the
LPDDR4 memory losing data contents and lead to possible data
integrity issues above 85 °C.
Errata provides three possible workaround options, while option 2
is the most reasonable:
Disable the automatic derating logic of the DDR controller and
apply fixed x2 refresh rate (0.5x refresh). This option is
suitable for designs that are expected to boot at or above 85 °C
and memory’s MR4[2:0] (Refresh Rate) DOES NOT report the following
conditions:
3b101: 0.25x refresh, no de-rating
3b110: 0.25x refresh, with de-rating
3b111: SDRAM High temperature operating limit exceeded
[1]: https://www.nxp.com/docs/en/errata/IMX8MM_0N87W.pdf
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
This adds initial minimal support for the Toradex Verdin iMX8M Mini Quad
2GB WB IT V1.0A module. They are now strapped to boot from eFuses which
are factory fused to properly boot from their on-module eMMC. U-Boot
supports booting from the on-module eMMC only, SDP support is disabled
for now due to missing i.MX 8M Mini USB support.
Functionality wise the following is known to be working:
- eMMC, 8-bit and 4-bit MMC/SD card slots
- Ethernet
- GPIOs
- I2C
Boot sequence is:
SPL ---> ATF (TF-A) ---> U-boot proper
ATF, U-boot proper and u-boot.dtb images are packed into a FIT image,
loaded by SPL.
Boot:
U-Boot SPL 2020.01-00187-gd411d164e5 (Jan 26 2020 - 04:47:26 +0100)
Normal Boot
Trying to boot from MMC1
NOTICE: Configuring TZASC380
NOTICE: RDC off
NOTICE: BL31: v2.0(release):rel_imx_4.14.98_2.3.0-0-g09c5cc994-dirty
NOTICE: BL31: Built : 01:11:41, Jan 25 2020
NOTICE: sip svc init
U-Boot 2020.01-00187-gd411d164e5 (Jan 26 2020 - 04:47:26 +0100)
CPU: Freescale i.MX8MMQ rev1.0 at 0 MHz
Reset cause: POR
DRAM: 2 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... OK
In: serial
Out: serial
Err: serial
Model: Toradex Verdin iMX8M Mini Quad 2GB Wi-Fi / BT IT V1.0A, Serial#
06535149
Net: eth0: ethernet@30be0000
Hit any key to stop autoboot: 0
Verdin iMX8MM #
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
