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diff --git a/board/gen860t/README b/board/gen860t/README deleted file mode 100644 index 3ef8ae1..0000000 --- a/board/gen860t/README +++ /dev/null @@ -1,131 +0,0 @@ -This directory contains board specific code for a generic MPC860T based -embedded computer, called 'GEN860T'. The design is generic in the sense that -common, readily available components are used and that the architecture of the -system is relatively straightforward: - - One eight bit wide boot (FLASH) memory - 32 bit main memory using SDRAM - DOC 2000+ - Ethernet PHY - Some I2C peripheral devices: Atmel AT24C256 EEPROM, Maxim DS1337 RTC. - Some other miscellaneous peripherals - -NOTE: There are references to a XIlinx FPGA and Mil-Std 1553 databus in this -port. I guess the computer is not as generic as I first said 8) However, -these extras can be safely ignored. - -Given the GEN860T files, it should be pretty easy to reverse engineer the -hardware configuration, if that's useful to you. Hopefully, this code will -be useful to someone as a basis for a port to a new system or as a head start -on a custom design. If you end up using any of this, I would appreciate -hearing from you, especially if you discover bugs or find ways to improve the -quality of this U-Boot port. - -Here are the salient features of the system: -Clock : 33.3 Mhz oscillator -Processor core frequency : 66.6 Mhz if in 1:2:1 mode; can also run 1:1 -Bus frequency : 33.3 Mhz - -Main memory: - Type : SDRAM - Width : 32 bits - Size : 64 mibibytes - Chip : Two Micron MT48LC16M16A2TG-7E - CS : MPC860T CS1*/UPMA - UPMA CONNECTIONS: - SDRAM A10 : GPLA0* - SDRAM CAS* : GPLA2* - SDRAM WE* : GPLA3* - SDRAM RAS* : GPLA4* - -Boot memory: - Type : FLASH - Width : 8 bits - Size : 16 mibibytes - Chip : One Intel 28F128J3A (StrataFlash) - CS : MPC860T CS0*/GPCM (this is the "boot" chip select) - -EEPROM memory: - Type : Serial I2C EEPROM - Width : 8 bits - Size : 32 kibibytes - Chip : One Atmel AT25C256 - CS : 0x50 (external I2C address pins on device are tied to GND) - -Filesystem memory: - Type : NAND FLASH (Toshiba) - Width : 8 bits (i.e. interface to DOC is 8 bits) - Size : 32 mibibytes - Chip : One DiskOnCHip Millenium Plus (DOC 2000+) - CS : MPC860T CS2*/GPCM - -Network support: - MAC : MPC86OT FEC (Fast Ethernet Controller) - PHY : Intel LXT971A - MII Addr: 0x0 (hardwired on the board) - MII IRQ : - -Console: - RS-232 on SMC1 (Maxim MAX3232 LVCMOS-RS232 level shifter) - -Real Time Clock: - Type : Low power, I2C interface - Chip : Maxim DS1337 - CS : Address 0x68 on I2C bus - - The MPC860T's internal RTC has a defect in Mask rev D that increases - the current drain on the KAPWR line to 10 mA. Since this is an - unreasonable amount of current draw for a RTC, and Motorola does not - plan to fix this in future mask revisions, a serial (I2C) RTC that - works has been included instead. NOTE that the DS1337 can be - configured to output a 32768 Hz clock while the main power is on. - This clock output has been routed to the MPC860T's EXTAL pin to allow - the internal RTC to be used. NOTE also that due to yet another - defect in the rev D mask, the RTC does not operate reliably when the - internal RTC divisor is set to use a 32768 Hz reference. So just use - the I2C RTC. - -Miscellaneous: - Xilinx Virtex FPGA on CS3*/GPCM. - Virtex FPGA slave SelectMap interface on cs4*/UPMB. - Mil-Std 1553 databus interface on CS5*/GPCM. - Audio sounder (beeper) with digital volume control connected to SPKROUT. - -SC variant: - A reduced-feature version of the GEN860T port is also supported: GEN860T_SC. - The 'SC' variant only provides support for the Virtex FPGA, SDRAM main - memory, EEPROM and flash memory. The system clock frequency is reduced - to 24 MHz. - -Issues: - The DOC 2000+ returns 0x40 as its device ID when probed using the method - desxribed in the DOC datasheet. Unfortunately, the U-Boot DOC driver - does not recognize this device. As of this writing, it seems that MTD - does not support the DOC 2000+ either. - -Status: - Everything appears to work except DOC support. As of this writing, - David Woodhouse has stated on the MTD mailing list that he has no - knowledge of the DOC Millineum Plus and therfore there is no support - in MTD for this device. I wish I had known this sooner :( - -The GEN860T board specific files and configuration is based on the work -of others who have contributed to U-Boot. The copyright and license notices -of these authors have been retained wherever their code has been reused. -All new code to support the GEN860T board is: - - (C) Copyright 2001-2003 - Keith Outwater (keith_outwater@mvis.com) - -and the following license applies: - -SPDX-License-Identifier: GPL-2.0+ - -Thanks to Wolfgang Denk for a great software package and to everyone -who contributed to its development. - -Keith Outwater -Sr. Staff Engineer -Microvision, Inc. -<keith_outwater@mvis.com> -<outwater@eskimo.com> |