PCI device memory bars issue

There has one MV64460 on my board, which contains 2 PCI buses: PCI0 and PCI1. PCI0 contains a transparent bridge. A PCI device locates behind the transparent bridge. The PCI device has 2 memory bars. When I read on memory bar0, it returns correct data. However, 0xffffffff returns from memory bar1.

I dump config space of the PCI device and find everything seems ok.

PCI_VENDOR_ID:       0x000010ee
PCI_DEVICE_ID:       0x00000300
PCI_COMMAND:         0x00000086
PCI_STATUS:          0x00000a00
PCI_CLASS_REVISION:  0x0b400000
PCI_CACHE_LINE_SIZE: 0x0000ff00
PCI_BASE_ADDRESS_0:  0x80800008
PCI_SPACE_SIZE_0:    0xfffff008
PCI_BASE_ADDRESS_1:  0x80801008
PCI_SPACE_SIZE_1:    0xfffff008
PCI_BASE_ADDRESS_2:  0x00000000
PCI_SPACE_SIZE_2:    0x00000000
PCI_BASE_ADDRESS_3:  0x00000000
PCI_SPACE_SIZE_3:    0x00000000
PCI_BASE_ADDRESS_4:  0x00000000
PCI_SPACE_SIZE_4:    0x00000000
PCI_BASE_ADDRESS_5:  0x00000000
PCI_SPACE_SIZE_5:    0x00000000

Thanks in advance for any suggestions.