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This modified version of QEMU contains OX Controller as an emulated device. The OX code is embedded within the QEMU code and implements a PCI handler for the QEMU environment (please see OX documentation for more details about PCI handlers).

You will find the OX code embedded in QEMU under '/hw/block/ox-ctrl/'

As storage backend, qemu-ox implements a media manager called VOLT. It creates DRAM memory structures and simulates NAND geometry by mapping memory addresses to physical page addresses. Please check the code under '/hw/block/ox-ctrl/mmgr/volt/' for more details.