Part Number: SK-TDA4VM
Dear experts
1)
I wonder what happens if there is no image on EEPROM in SK-TDA4VM.
2)
Could you provide EEPROM image file ?
3)
Could you provide spread sheet for CPLD in SK-TDA4VM that describes default pull up or pulled down pin assignment?
Hi Jaecheon,
1) I would recommend referencing this E2E: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1094199/tda4vm-eeprom-data-for-tda4-evm
2) I would recommend referencing the SK-TDA4VM user guide: https://www.ti.com/lit/ug/spruj21d/spruj21d.pdf. Particularly, section "4.5 Identification EEPROM" which I have screenshotted and copied below for convenience:
3) The CPLD content is included in the zip file under "Design files" on the SK-TDA4VM purchase page: https://www.ti.com/tool/SK-TDA4VM. I will also link the direct link on the SK-TDA4VM for convenience: https://www.ti.com/lit/zip/sprr438. The file named "top_cpld.v" has the content that is programmed into the CPLD.
Regards,
Takuma
Hi Jaecheon,
There is some dependency in U-Boot and kernel for loading in the correct board information like device tree, which I think EEPROM is being used to identify the board. Theoretically, it should be possible to skip EEPROM if you change the uEnv.txt file in the boot partition to set and load in the correct environment variables and overlays. Additionally, you may need to do something similar to what a customer is doing for AM64x: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1359198/am6442-how-to-bypass-the-eeprom-checking-procedure.
Also, it seems Linux is struggling to read EEPROM, but U-Boot can read EEPROM. While booting, press any keys to stop U-Boot and run "i2c dev 0" and "i2c md 0x51 0x0.2 0x100" to read EEPROM which should have something like:
U-Boot 2023.04-g71b8c840ca (Nov 27 2023 - 08:55:35 +0000) SoC: J721E SR1.1 GP Model: Texas Instruments J721E SK A72 Board: J721EX-EAIK rev A1 DRAM: 4 GiB Core: 121 devices, 34 uclasses, devicetree: separate Flash: 0 Bytes MMC: mmc@4fb0000: 1 Loading Environment from nowhere... OK In: serial@2800000 Out: serial@2800000 Err: serial@2800000 am65_cpsw_nuss ethernet@46000000: K3 CPSW: nuss_ver: 0x6BA00101 cpsw_ver: 0x6BA80100 ale_ver: 0x00293904 Ports:1 mdio_freq:1000000 Net: eth0: ethernet@46000000port@1 Hit any key to stop autoboot: 0 => i2c dev 0 Setting bus to 0 => i2c md 0x51 0x0.2 0x100 0000: aa 55 33 ee 01 37 00 10 2e 00 4a 37 32 31 45 58 .U3..7....J721EX 0010: 2d 45 41 49 4b 00 00 00 00 00 41 31 30 31 31 32 -EAIK.....A10112 0020: 30 31 41 31 00 00 30 31 30 31 32 31 32 32 00 00 01A1..01012122.. 0030: 00 00 00 00 31 33 33 32 11 02 00 60 7d fe ff ff ....1332...`}... 0040: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 0050: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 0060: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 0070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 0090: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 00a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 00b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 00c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 00d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 00e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 00f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ =>
As for CPLD pin assignments, I would again recommend referencing top_cpld.v. However, in addition to this file, please reference PROC112B(001)_SCH.pdf file that is included in the same location as top_cpld.v file. The value of these pins depend on the hardware schematics. I see that most of the inputs are connected to the bootmode DIP switches, and some reset signals for PCIe and the SoC. The names are pretty similar between schematic and top_cpld.v such that you can map which pins connect to where, and whether they have pull up/pull down resistors, etc.
Regards,
Takuma
