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