TDA4VEN-Q1: Reduced memory for ddr

bing zhu

Intellectual 360 points

Part Number: TDA4VEN-Q1
Other Parts Discussed in Thread: AM62P

Tool/software:

Hi, experts ,

board: J722SXH01

sdk: 10_00_00_08

I want to use only 2 GiB of ram on evm board, default is 8 GiB. I have made the following changes:

--- a/ti-processor-sdk-linux-adas-j722s-evm-10_00_00_08/board-support/ti-u-boot-2024.04+git/arch/arm/dts/k3-j722s-evm.dts
+++ b/ti-processor-sdk-linux-adas-j722s-evm-10_00_00_08/board-support/ti-u-boot-2024.04+git/arch/arm/dts/k3-j722s-evm.dts
@@ -33,8 +33,8 @@

memory@80000000 {
/* 8G RAM */
- reg = <0x00000000 0x80000000 0x00000000 0x80000000>,
- <0x00000008 0x80000000 0x00000001 0x80000000>;
+ reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
+ // <0x00000008 0x80000000 0x00000001 0x80000000>;
device_type = "memory";
bootph-all;
};

--- a/ti-processor-sdk-linux-adas-j722s-evm-10_00_00_08/board-support/ti-linux-kernel-6.6.32+git-ti/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
+++ b/ti-processor-sdk-linux-adas-j722s-evm-10_00_00_08/board-support/ti-linux-kernel-6.6.32+git-ti/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
@@ -31,8 +31,8 @@ chosen {

memory@80000000 {
/* 8G RAM */
- reg = <0x00000000 0x80000000 0x00000000 0x80000000>,
- <0x00000008 0x80000000 0x00000001 0x80000000>;
+ reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
+ // <0x00000008 0x80000000 0x00000001 0x80000000>;
device_type = "memory";
bootph-all;
};

uboot has recognised 2 GiB but it is stuck in the kernel, please let me know if i need to change anything else?

evm_kernel_hang.log evm_start_ok.log

Best Regards,

Bing

11 months ago

0 Keerthy J 11 months ago

TI__Guru**** 162350 points

Hi,

FAQ: https://e2e.ti.com/f/791/t/1224003

Default is for 16GB. The FAQ shows how to reduce it to 4GB. So similar steps can be followed to reduce to 2GB.

Thanks,
Keerthy

0 bing zhu 11 months ago in reply to Keerthy J

Intellectual 360 points

Hi,Keerthy

The version of sdk I am using is 10_00_00_08,there is no dram_init_banksize function in evm.c.

Best Regards,

Bing

0 Keerthy J 11 months ago in reply to bing zhu

TI__Guru**** 162350 points

Hi Bing,

bing zhu said:
The version of sdk I am using is 10_00_00_08,there is no dram_init_banksize function in evm.

Skip that change, it is no longer needed.

diff --git a/arch/arm/dts/k3-j721s2-ddr.dtsi b/arch/arm/dts/k3-j721s2-ddr.dtsi
index 6a244fb7ac..7dabc2999b 100644
--- a/arch/arm/dts/k3-j721s2-ddr.dtsi
+++ b/arch/arm/dts/k3-j721s2-ddr.dtsi
@@ -2230,6 +2230,7 @@
 		};
 
 		memorycontroller1: memorycontroller@29b0000 {
+			status = "disabled";
 			compatible = "ti,j721s2-ddrss";
 			reg = <0x0 0x029b0000 0x0 0x4000>,
 			      <0x0 0x0114000 0x0 0x100>;
diff --git a/arch/arm/dts/k3-j721s2-som-p0.dtsi b/arch/arm/dts/k3-j721s2-som-p0.dtsi
index f3080e948e..9e91110d90 100644
--- a/arch/arm/dts/k3-j721s2-som-p0.dtsi
+++ b/arch/arm/dts/k3-j721s2-som-p0.dtsi
@@ -13,9 +13,9 @@
 / {
 	memory@80000000 {
 		device_type = "memory";
-		/* 16 GB RAM */
+		/* 4 GB RAM */
 		reg = <0x00 0x80000000 0x00 0x80000000>,
-		      <0x08 0x80000000 0x03 0x80000000>;
+		      <0x08 0x80000000 0x00 0x80000000>;
 	};

The above should suffice. Let me know if that helps.

- Keerthy

0 bing zhu 11 months ago in reply to Keerthy J

Intellectual 360 points

Hi,Keerthy

bing zhu said:
board: J722SXH01

I am using j722sx and I checked all the associated device trees and there is no memorycontroller node.

Best Regards,

Bing

0 Keerthy J 11 months ago in reply to bing zhu

TI__Guru**** 162350 points

Hi Bing,

Understood. Can you just do the U-Boot changes alone and try to boot with the default kernel DTB?

- Keerthy

0 bing zhu 11 months ago in reply to Keerthy J

Intellectual 360 points

Hi,Keerthy

I changed the uboot alone, and it still does the same thing.

Best Regards,

Bing

0 Keerthy J 11 months ago in reply to bing zhu

TI__Guru**** 162350 points

Okay. I will reproduce the issue and get back to you.

Thanks for trying out the suggestions.

- Keerthy

0 bing zhu 11 months ago in reply to Keerthy J

Intellectual 360 points

Hi,Keerthy

You're welcome, please keep us posted if you get any new developments, thanks!

Best Regards,

Bing

0 Keerthy J 11 months ago in reply to bing zhu

TI__Guru**** 162350 points

Hello Bing,

I have reproduced the issue. Even with 4GB DDR i am observing the issue. My first suspect is some of the reserved memories are still accessing
beyond the reduced region. I will keep you posted.

- Keerthy

+1 Keerthy J 11 months ago in reply to Keerthy J

TI__Guru**** 162350 points

HI Bing,

Please use the patch below:

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/0001_2D00_arm_2D00_mach_2D00_k3_2D00_j722s_2D00_am62p_2D00_Fixup_2D00_TF_2D00_A_2D00_OP_2D00_TEE_2D00_reserved_2D00_m.patch

Apply the above patch in U-Boot.

Fix up the mmu as well:

diff --git a/arch/arm/mach-k3/arm64-mmu.c b/arch/arm/mach-k3/arm64-mmu.c
index 07edbde6..69ab06e9 100644
--- a/arch/arm/mach-k3/arm64-mmu.c
+++ b/arch/arm/mach-k3/arm64-mmu.c
@@ -295,12 +295,14 @@ struct mm_region soc_mem_map[NR_MMU_REGIONS] = {
                .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
                         PTE_BLOCK_INNER_SHARE
        }, {
+#if 0
                .virt = 0x880000000UL,
                .phys = 0x880000000UL,
                .size = 0x80000000UL,
                .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
                         PTE_BLOCK_INNER_SHARE
        }, {
+#endif
                .virt = 0x500000000UL,
                .phys = 0x500000000UL,
                .size = 0x380000000UL,

In the boot partition uEnv.txt:

#dorprocboot=1
#name_overlays=ti/k3-j722s-vision-apps.dtbo

comment out the above as the default vision_apps needs bigger DDR footprint .

With that I was able to go past the issue you have seen but remote cores are erring out and causes reset just before Linux command prompt.

- Keerthy

0 bing zhu 11 months ago in reply to Keerthy J

Intellectual 360 points

Hi,Keerthy

Yes, following your instructions I am now able to get to the linux shell, but the remote kernel load fails as follows:

[ 11.123907] OF: graph: no port node found in /bus@f0000/dss@30220000/oldi-txes/oldi@1/ports
[ 11.126338] remoteproc remoteproc4: powering up 78400000.r5f
[ 11.140526] remoteproc remoteproc4: Booting fw image j722s-main-r5f0_0-fw, size 1084320
[ 11.149562] OF: graph: no port node found in /bus@f0000/dss@30220000/oldi-txes/oldi@1/ports
[ 11.152275] remoteproc remoteproc4: bad phdr da 0xa3ffec00 mem 0x1400
[ 11.166166] remoteproc remoteproc4: Failed to load program segments: -22

Is it because the device tree is missing the dss@30220000 node? How can I fix it, because later our project resource allocation will not allocate dss on A core.

Best Regards,

Bing

0 Keerthy J 11 months ago in reply to bing zhu

TI__Guru**** 162350 points

Hi Bing,

Currently vision_apps is also disabled. So my first question is what is the end use case for this project?
I believe you need vision_apps features right?

- Keerthy

0 bing zhu 11 months ago in reply to Keerthy J

Intellectual 360 points

Hi,Keerthy

I need vision_apps , but the dss resource will be used at main-r5f0_0.

Best Regards,

Bing

0 Keerthy J 11 months ago in reply to bing zhu

TI__Guru**** 162350 points

Hi Bing,

Okay. I will let our vision_apps expert comment on how to change the memory map that fits into 2GB.
Expect 1-2 days to analyze and get back. We will provide feedback here once we analyze.

- Keerthy

+1 Nikhil Dasan 11 months ago in reply to Keerthy J

TI__Guru* 84696 points

Hi,

Have you reduced the vision_apps memory map to fit into 2GB as well?

Please refer the below documentation to modify the same.

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-j722s/10_00_00_05/exports/docs/psdk_rtos/docs/user_guide/developer_notes_memory_map.html

Regards,

Nikhil Dasan

Processors

Processors forum

TDA4VEN-Q1: Reduced memory for ddr