How to access the 8GB ram of DDR in Agilex 7

Hi AdzimZM,

I tried this already.Nothing happened,throws same error "TFTP error: trying to overwrite reserved memory...".

Thanks,

M Gokulraj

Hi,

still the error not resolved and i doubt,memory region mapping is not the issue.While using bdinfo command in u-boot terminal it clearly shows the mapped 8gb of address,but the issue is only 2GB is effective remaining 6GB is reserved.Refer the below log.

bdinfo log

"

lmb_dump_all:
memory.cnt = 0x2 / max = 0x10
memory[0] [0x0-0x7fffffff], 0x80000000 bytes flags: 0 ( 2GB )
memory[1] [0x280000000-0x3ffffffff], 0x180000000 bytes flags: 0 ( 6GB )
reserved.cnt = 0x4 / max = 0x10
reserved[0] [0x0-0x1ffffff], 0x02000000 bytes flags: 4
reserved[1] [0x7eb08000-0x7fffffff], 0x014f8000 bytes flags: 0
reserved[2] [0x7fb0e940-0x7fffffff], 0x004f16c0 bytes flags: 0
reserved[3] [0x280000000-0x3ffffffff], 0x180000000 bytes flags: 0 ( Reserved 6GB )

"

2.Checked the serial console while running the u-boot,which mentioned DDR : 8192 MiB but DRAM: 2 GiB (effective 8 GiB)

u-boot serial console log

"

U-Boot SPL 2024.07-36773-g0dad0a0a478-dirty (Feb 11 2025 - 12:14:33 +0530)
Reset state: Cold
MPU 1350000 kHz
L4 Main 400000 kHz
L4 sys free 100000 kHz
L4 MP 200000 kHz
L4 SP 100000 kHz
SDMMC 50000 kHz
DDR: 8192 MiB
SDRAM-ECC: Initialized success with 13735 ms
QSPI: Reference clock at 400000 kHz
WDT: Started watchdog@ffd00200 with servicing every 1000ms (10s timeout)
Trying to boot from MMC1
## Checking hash(es) for config board-0 ... OK
## Checking hash(es) for Image atf ... crc32+ OK
## Checking hash(es) for Image uboot ... crc32+ OK
## Checking hash(es) for Image fdt-0 ... crc32+ OK
NOTICE: BL31: v2.10.0 (release):
NOTICE: BL31: Built : 14:42:42, Dec 19 2024


U-Boot 2023.10 (Dec 24 2024 - 15:22:57 +0530)socfpga_agilex

CPU: Intel FPGA SoCFPGA Platform (ARMv8 64bit Cortex-A53)
Model: SoCFPGA Agilex SoCDK
DRAM: 2 GiB (effective 8 GiB)
Core: 27 devices, 22 uclasses, devicetree: separate
WDT: Started watchdog@ffd00200 with servicing every 1000ms (10s timeout)
MMC: dwmmc0@ff808000: 0
Loading Environment from FAT... Unable to read "uboot.env" from mmc0:1...
In: serial0@ffc02000
Out: serial0@ffc02000
Err: serial0@ffc02000
Net:
Warning: ethernet@ff804000 (eth0) using random MAC address - 1a:8f:6a:b4:eb:81
eth0: ethernet@ff804000
Hit any key to stop autoboot: 0

"

I have attached the serial console and bdinfo log image for your reference.

Thanks,

M Gokulraj

Hi,

Even after changing the device tree as you mentioned above.Same error occurs.

Here in the u-boot dts file what ever the memory [1] region,it mapped as reserved area.

Please take a look at the bdinfo log of updated device tree log.

bdinfo log

"

lmb_dump_all:
memory.cnt = 0x2 / max = 0x10
memory[0] [0x0-0x7fffffff], 0x80000000 bytes flags: 0 ( 2GB )

memory[1] [0x1080000000-0x11dfffffff], 0x160000000 bytes flags: 0

reserved.cnt = 0x4 / max = 0x10
reserved[0] [0x0-0x1ffffff], 0x02000000 bytes flags: 4
reserved[1] [0x7eb08000-0x7fffffff], 0x014f8000 bytes flags: 0

reserved[2] [0x1080000000-0x11dfffffff], 0x160000000 bytes flags: 0

"

I believe the issue is not memory mapping node,it is reserved area mapping.

For your information,I am using Agilex 7soc not Agilex 7m and I have shared the default .dts file for your reference.

Thanks,

M Gokulraj

Hi

No,8GB is not accessible in linux environment too.Here the condition is " 1. If u-boot can access 8GB then linux environment can access 8GB of RAM ,2. If u-boot can't access 8GB then linux environment will not access 8GB of RAM".

Refer u-boot-socfpga-socfpga_v2021.07 version.By using this u-boot version i'm able to access full sdram but unable to write in emmc.

I have compared the files related to reserved memory and sdram with latest u-boot version but i have no clue were it is configured.It has lots of main files and include files.

Thanks,

M Gokulraj

Hi,

Could you share the reference or user guide and download link for the uboot branch QPDS24.3.1_REL_GSRD_PR.

Thanks,

M Gokulraj

Hi,

The patch doesn't work,but i managed to write data in the reserved memory memory[1] region.

And now I stuck in another issue " mmc blocks written = error"

I have attached the error log image and configured load address as 0x280000000.

Thanks,

M Gokulraj

Hi,

The solution you suggested for problems related in SD-card partition.Here the main issue is in reading 64bit memory address.

"mmc write" command can take 32bit memory address and its is working fine,but while using 64bit memory address it's locked in timeout error. I've confirmed it by debugging the u-boot code while using "mmc write" command.

will you check with the file related to mmc in driver and include folder in your side and give me a solution.

Thanks

Gokulraj

Hi,

I'm unable to access the intel-innersource. It's not a public repositorie.

Thanks

Gokulraj