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diff --git a/board/sbc8548/README b/board/sbc8548/README new file mode 100644 index 0000000..feac5e3 --- /dev/null +++ b/board/sbc8548/README @@ -0,0 +1,269 @@ +Intro: +====== + +The SBC8548 is a stand alone single board computer with a 1GHz +MPC8548 CPU, 8MB boot flash, 64MB user flash and, 256MB DDR2 400MHz +memory. It also has 128MB SDRAM 100MHz LBC memory, with both a PCI-e, +and a PCI-X slot, dual mini-DB9 for UART, and dual RJ-45 for eTSEC +ethernet connections. + +U-boot Configuration: +===================== + +The following possible u-boot configuration targets are available: + + 1) sbc8548_config + 2) sbc8548_PCI_33_config + 3) sbc8548_PCI_66_config + 4) sbc8548_PCI_33_PCIE_config + 5) sbc8548_PCI_66_PCIE_config + +Generally speaking, most people should choose to use #5. Details +of each choice are listed below. + +Choice #1 does not enable CONFIG_PCI, and assumes that the PCI slot +will be left empty (M66EN high), and so the board will operate with +a base clock of 66MHz. Note that you need both PCI enabled in u-boot +and linux in order to have functional PCI under linux. + +The second enables PCI support and builds for a 33MHz clock rate. Note +that if a 33MHz 32bit card is inserted in the slot, then the whole board +will clock down to a 33MHz base clock instead of the default 66MHz. This +will change the baud clocks and mess up your serial console output if you +were previously running at 66MHz. If you want to use a 33MHz PCI card, +then you should build a U-Boot with a _PCI_33_ config and store this +to flash prior to powering down the board and inserting the 33MHz PCI +card. [The above discussion assumes that the SW2[1-4] has not been changed +to reflect a different CCB:SYSCLK ratio] + +The third option builds PCI support in, and leaves the clocking at the +default 66MHz. Options four and five are just repeats of option two +and three, but with PCI-e support enabled as well. + +PCI output listing with an intel e1000 PCI-x and a Syskonnect SK-9Exx +is shown below for sbc8548_PCI_66_PCIE_config. (Note that PCI-e with +a 33MHz PCI configuration is currently untested.) + + => pci 0 + Scanning PCI devices on bus 0 + BusDevFun VendorId DeviceId Device Class Sub-Class + _____________________________________________________________ + 00.00.00 0x1057 0x0012 Processor 0x20 + 00.01.00 0x8086 0x1026 Network controller 0x00 + => pci 1 + Scanning PCI devices on bus 1 + BusDevFun VendorId DeviceId Device Class Sub-Class + _____________________________________________________________ + 01.00.00 0x1957 0x0012 Processor 0x20 + => pci 2 + Scanning PCI devices on bus 2 + BusDevFun VendorId DeviceId Device Class Sub-Class + _____________________________________________________________ + 02.00.00 0x1148 0x9e00 Network controller 0x00 + => + +Memory Size and using SPD: +========================== + +The default configuration uses hard coded memory configuration settings +for 256MB of DDR2 @400MHz. It does not by default use the DDR2 SPD +EEPROM data to read what memory is installed. + +There is a hardware errata, which causes the older local bus SDRAM +SPD EEPROM to land at the same address as the DDR2 SPD EEPROM, so +that the SPD data can not be read reliably. You can test if your +board has the errata fix by running "i2c probe". If you see 0x53 +as a valid device, it has been fixed. If you only see 0x50, 0x51 +then your board does not have the fix. + +You can also visually inspect the board to see if this hardware +fix has been applied: + + 1) Remove R314 (RES-R0174-033, 1K, 0603). R314 is located on + the back of the PCB behind the DDR SDRAM SODIMM connector. + 2) Solder RES-R0174-033 (1K, 0603) resistor from R314 pin 2 pad + to R313 pin 2. Pin 2 for each resistor is the end of the + resistor closest to the CPU. + +Boards without the mod will have R314 and R313 in parallel, like "||". +After the mod, they will be touching and form an "L" shape. + +If you want to upgrade to larger RAM size, you can simply enable + #define CONFIG_SPD_EEPROM + #define CONFIG_DDR_SPD +in include/configs/sbc8548.h file. (The lines are already there +but listed as #undef). + +If you did the i2c test, and your board does not have the errata +fix, then you will have to physically remove the LBC 128MB DIMM +from the board's socket to resolve the above i2c address overlap +issue and allow SPD autodetection of RAM to work. + + +Updating U-boot with U-boot: +============================ + +Note that versions of u-boot up to and including 2009.08 had u-boot stored +at 0xfff8_0000 -> 0xffff_ffff (512k). Currently it is being stored from +0xfffa_0000 -> 0xffff_ffff (384k). If you use an old macro/script to +update u-boot with u-boot and it uses the old address, you will render +your board inoperable, and you will require JTAG recovery. + +The following steps list how to update with the current address: + + tftp u-boot.bin + md 200000 10 + protect off all + erase fffa0000 ffffffff + cp.b 200000 fffa0000 60000 + md fffa0000 10 + protect on all + +The "md" steps in the above are just a precautionary step that allow +you to confirm the u-boot version that was downloaded, and then confirm +that it was copied to flash. + +The above assumes that you are using the default board settings which +have u-boot in the 8MB flash, tied to /CS0. + +If you are running the default 8MB /CS0 settings but want to store an +image in the SODIMM that is built with CONFIG_SYS_ALT_BOOT enabled, +(as a backup, etc) then the steps will become: + + tftp u-boot.bin + md 200000 10 + protect off all + era eff00000 efffffff + cp.b 200000 eff00000 100000 + md eff00000 10 + protect on all + +Finally, if you are running the alternate 64MB /CS0 settings and want +to update the in-use u-boot image, then (again with CONFIG_SYS_ALT_BOOT +enabled) the steps will become: + + tftp u-boot.bin + md 200000 10 + protect off all + era fff00000 ffffffff + cp.b 200000 fff00000 100000 + md fff00000 10 + protect on all + + +Hardware Reference: +=================== + +The following contains some summary information on hardware settings +that are relevant to u-boot, based on the board manual. For the +most up to date and complete details of the board, please request the +reference manual ERG-00327-001.pdf from www.windriver.com + +Boot flash: + intel V28F640Jx, 8192x8 (one device) at 0xff80_0000 + +Sodimm flash: + intel V28F128Jx, 16384x8 (4 devices) at 0xfb80_0000 + Note that this address reflects the default setting for + the JTAG debugging tools, but since the alignment is + rather inconvenient, u-boot puts it at 0xec00_0000. + + + Jumpers: + +Jumper Name ON OFF +---------------------------------------------------------------- +JP12 CS0/CS6 swap see note[*] see note[*] + +JP13 SODIMM flash write OK writes disabled + write prot. + +JP14 HRESET/TRST joined isolated + +JP15 PWR ON when AC pwr use S1 for on/off + +JP16 Demo LEDs lit not lit + +JP19 PCI mode PCI PCI-X + + +[*]JP12, when jumpered parallel to the SODIMM, puts the boot flash +onto /CS0 and the SODIMM flash on /CS6 (default). When JP12 +is jumpered parallel to the LBC-SDRAM, then /CS0 is for the +SODIMM flash and /CS6 is for the boot flash. Note that in this +alternate setting, you also need to switch SW2.8 to ON. +See the setting CONFIG_SYS_ALT_BOOT if you want to use this setting +and boot u-boot from the 64MB SODIMM + + + Switches: + +The defaults are marked with a * + +Name Desc. ON OFF +------------------------------------------------------------------ +S1 Pwr toggle n/a n/a + +SW2.1 CFG_SYS_PLL0 1 0* +SW2.2 CFG_SYS_PLL1 1* 0 +SW2.3 CFG_SYS_PLL2 1* 0 +SW2.4 CFG_SYS_PLL3 1 0* +SW2.5 CFG_CORE_PLL0 1* 0 +SW2.6 CFG_CORE_PLL1 1 0* +SW2.7 CFG_CORE_PLL2 1* 0 +SW2.8 CFG_ROM_LOC1 1 0* + +SW3.1 CFG_HOST_AGT0 1* 0 +SW3.2 CFG_HOST_AGT1 1* 0 +SW3.3 CFG_HOST_AGT2 1* 0 +SW3.4 CFG_IO_PORTS0 1* 0 +SW3.5 CFG_IO_PORTS0 1 0* +SW3.6 CFG_IO_PORTS0 1 0* + +SerDes CLK(MHz) SW5.1 SW5.2 +---------------------------------------------- +25 0 0 +100* 1 0 +125 0 1 +200 1 1 + +SerDes CLK spread SW5.3 SW5.4 +---------------------------------------------- ++/- 0.25% 0 0 +-0.50% 1 0 +-0.75% 0 1 +No Spread* 1 1 + +SW4 settings are readable from the EPLD and are currently not used for +any hardware settings (i.e. user configuration switches). + + LEDs: + +Name Desc. ON OFF +------------------------------------------------------------------ +D13 PCI/PCI-X PCI-X PCI +D14 3.3V PWR 3.3V no power +D15 SYSCLK 66MHz 33MHz + + + Default Memory Map: + +start end CS<n> width Desc. +---------------------------------------------------------------------- +0000_0000 0fff_ffff MCS0,1 64 DDR2 (256MB) +f000_0000 f7ff_ffff CS3,4 32 LB SDRAM (128MB) +f800_0000 f8b0_1fff CS5 - EPLD +fb80_0000 ff7f_ffff CS6 32 SODIMM flash (64MB) [*] +ff80_0000 ffff_ffff CS0 8 Boot flash (8MB) + +[*] fb80 represents the default programmed by WR JTAG register files, + but u-boot places the flash at either ec00 or fc00 based on JP12. + +The EPLD on CS5 demuxes the following devices at the following offsets: + +offset size width device +-------------------------------------------------------- +0 1fff 8 7 segment display LED +10_0000 1fff 4 user switches +30_0000 1fff 4 HW Rev. register +b0_0000 1fff 8 8kB EEPROM |