[U-Boot] A question in lowlevel_init.S

Hello everybody, I have a question pertaining to almost every lowlevel_init.S. The code goes like

/*make r0 relative the current location so that it*/ /*reads SMRDATA out of flash rather than memory*/ ldr r0,=SMRDATA ldr r1,_TEXT_BASE sub r10,r0,r1

I couldn't relate the code to comments made ahead of that(how does TEXT_BASE - addrof(SMRDATA) yield the location of SMRDATA in flash. I totally dint get it. Please enlighten me. I greatly appreciate any response.

Thanks, Vamsi