If I -ALSO- connected the SPI pins to the SD card... can I initially do a READ of said TEXT file..
There are two bus protocols defined for SD Cards. The default mode is native SD mode but the card can be configured to use a slower SPI mode. Protocol selection is done during the first reset command after power up. The SD Card powers up in SD mode. To switch the card to SPI mode, the CS signal must be asserted while the host issues a reset command to the card. Once a particular protocol is configured, it cannot be changed while power is applied. The only way to switch between protocol modes is to do a power cycle.