SST_ISRX
isr.full = sst_shim_read64(drv->shim, SST_ISRX);
sst_shim_write64(drv->shim, SST_ISRX, isr.full);
isr.full = sst_shim_read64(sst_drv_ctx->shim, SST_ISRX);
sst_shim_write64(sst_drv_ctx->shim, SST_ISRX, isr.full);