SST_IPCX
ctx->ipc_reg.ipcx = SST_IPCX + ctx->pdata->ipc_info->ipc_offset;
header.full = sst_shim_read64(sst_drv_ctx->shim, SST_IPCX);
header.full = sst_shim_read64(sst_drv_ctx->shim, SST_IPCX);
sst_shim_write64(sst_drv_ctx->shim, SST_IPCX, msg->mrfld_header.full);