Hello,
the output capabilities of the LDO2 are <200mA. From TIDA-050000 i see this output provides the source for FPGA I/O Banks.
The Spartan 7 datasheet mentions a Power-On current of (Ivcco (4mA) + 40mA per Bank) * 7 = 308mA (For XC7S100 here).
I know this could be lowered with sequencing but isnt that very tight calculated or am i thinking something wrong here even on normal operation with DDR3 and Ethernet MAC running the same time 200mA is not enougth ??