What rev is your motherboard? The A2630 can be configured for 2 or 4 meg of RAM. So I would check the jumper setting to make sure it's not trying to grab 4 meg of Zorro2 space. Also, the mask value is only used for DMA and the GVP scsi driver should fall back to PIO for non-DMAable memory. But all Zorro2 memory is DMAable so I don't see how this could be the problem in any case.
