AN1806 Initializing Blank Flash Devices on Embedded Platforms Application Note
●Overview
■The method outlined in this application note uses one of the additional chip-select lines (RCS1, RCS2 and RCS3) that the MPC824X and the Tsi106 host bridge and Tsi107 host bridge provide. (RCS2 and RCS3 are available only on the MPC8245 and the Tsi107 host bridge.) With a small amount of hardware, the system can recover access to the local ROM when booting from PCI by relocating the local boot ROM to a different chip select. The system requires that the embedded controller has the following facilities:
▲Access to a PCI-hosted local ROM
▲Hardware to re-route RCS0 and one of RCS1, RCS2 or RCS3
■A suitable PCI-based flash is available on the Freescale Sandpoint reference platform. This system can serve as a suitable basis for PCI access because it uses the Winbond W83C553, which translates PCI memory accesses to 0xFFF0_0100 into ROM accesses. If Sandpoint is not used, a similar facility is needed on the target system.
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integrated processor 、 host bridge devices 、 embedded system |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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12/2003 |
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Rev. 1.2 |
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AN1806 |
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516 KB |
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