The IO voltage of HSIO Bank 2A is connected from the BUCK4 output of the PMIC regulator.
By default, 1.2V is set on PMIC BUCK4. To modify the PMIC BUCK4 output to 1.3V, execute the following U-Boot commands.
IG71M # i2c dev 0
IG71M # i2c probe
IG71M # i2c md 0x58 0xA5 1
IG71M # i2c mw 0x58 0xA5 0x4D 0x1
IG71M # i2c md 0x58 0xA5 1
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Agilex™ 3 SoC FPGA System on Module