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https://github.com/AsahiLinux/u-boot
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49 lines
1.4 KiB
Text
49 lines
1.4 KiB
Text
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Driver implementing the fuse API for Freescale's IC Identification Module (IIM)
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This IP can be found on the following SoCs:
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- MPC512x,
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- i.MX25,
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- i.MX27,
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- i.MX31,
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- i.MX35,
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- i.MX51,
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- i.MX53.
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The section numbers in this file refer to the i.MX25 Reference Manual.
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A fuse word contains 8 fuse bit slots, as explained in 30.4.2.2.1.
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A bank contains 256 fuse word slots, as shown by the memory map in 30.3.1.
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Some fuse bit or word slots may not have the corresponding fuses actually
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implemented in the fusebox.
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See the README files of the SoCs using this driver in order to know the
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conventions used by U-Boot to store some specific data in the fuses, e.g. MAC
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addresses.
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Fuse operations:
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Read
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Read operations are implemented as read accesses to the shadow registers,
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using "Word y of Bank x" from the register summary in 30.3.2. This is
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explained in detail in 30.4.5.1.
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Sense
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Sense operations are implemented as explained in 30.4.5.2.
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Program
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Program operations are implemented as explained in 30.4.5.3. Following
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this operation, the shadow registers are reloaded by the hardware (not
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immediately, but this does not make any difference for a user reading
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these registers).
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Override
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Override operations are implemented as write accesses to the shadow
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registers, as explained in 30.4.5.4.
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Configuration:
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CONFIG_FSL_IIM
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Define this to enable the fsl_iim driver.
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