PXA3xx Boot ROM Reference Manual - Marvell

5.6 mDOC SupportThe Sandisk mDOC memory is interfaced to the processor using the DFI bus with nCS2 as the bootchip select, much the same as OneNAND.Table 1, Version 2.xx and Version 3.xx High Level Differences, on page 15 states which version ofBoot ROM natively supports this memory device.The mDOC device acts as a NAND disk; however, no file system is mounted during the processorboot operation. Instead, the mDOC driver code resident in the processor Boot ROM allows accessesto the mDOC device via formatted partitions and sector offsets within the partitions.The TIM/NTIM must reside in Partition 2, Sector Offset 0. Any other images (OBM) must reside inPartition 2 or greater (applicable to Boot ROM versions 3.32 and later).NoteNoteWhen connecting the mDOC memory to a processor with a Boot ROM version 3.27 orearlier, the NTIM/TIM must be loaded to the XIP area at address 0x1000_0000. TheOBM image also resides in the XIP space and must contain an mDOC driver. The BootROM cannot directly access the mDOC memory until the driver has been loaded fromthe OBM boot code.Partition 1 is an OTP partition that stores keys for trusted boot operations, but otherwise is notusable. mDOC sectors are 512 bytes.The 32-bit flash address for mDOC images are calculated as follows:28 bit sector offset 4 bit partition #Here are examples of how to calculate Flash positions within the mDOC device for use with inputfiles for the TBB tool:mDOC address-------------------NTIM (must be in Partition 2, Sector Offset 0) = 0x2OBM in Partition 5 starting at Sector Offset 32 = 0x205OBM in Partition 3 starting at Sector Offset 506 = 0x1FA3NoteNoteVersion 3.xx Boot ROMs have the backwards compatibility mode where the header isoptional; however, if using mDOC in the system, a header (NTIM or TIM) MUST beimplemented (applies to ALL versions of Boot ROM).5.6.1 Exiting Low Power Mode and Resets with mDOCResuming from low power modes and reset exits are different depending on whether the Boot ROMhas the integrated driver. For example, the PXA320 B2 does not have the integrated driver formDOC memory. The Boot ROM can access only the XIP area. The PXA310 A2 does have the driverembedded so the Boot ROM enables direct accesses to the mDOC memory device at boot time,reset and low power mode exits as described in Table 9, Trusted Image Module Locations forTrusted Boot, on page 36.12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758Copyright © 2010 Marvell PUBLIC RELEASE Doc. No. MV-S301208-00 Rev. -Page 45