mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
e895a4b06f
This function can fail if the device tree runs out of space. Rather than silently booting with an incomplete device tree, allow the failure to be detected. Unfortunately this involves changing a lot of places in the code. I have not changed behvaiour to return an error where one is not currently returned, to avoid unexpected breakage. Eventually it would be nice to allow boards to register functions to be called to update the device tree. This would avoid all the many functions to do this. However it's not clear yet if this should be done using driver model or with a linker list. This work is left for later. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Anatolij Gustschin <agust@denx.de> |
||
|---|---|---|
| .. | ||
| asm_init.S | ||
| config.mk | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| mpc7448hpc2.c | ||
| README | ||
| tsi108_init.c | ||
Freescale MPC7448hpc2 (Taiga) board =================================== Created 08/11/2006 Roy Zang -------------------------- MPC7448hpc2 (Taiga) board is a high-performance PowerPC server reference design, which is optimized for high speed throughput between the processor and the memory, disk drive and Ethernet port subsystems. MPC7448hpc2(Taiga) is designed to the micro-ATX chassis, allowing it to be used in 1U or 2U rack-mount chassis¡¯, as well as in standard ATX/Micro-ATX chassis. Building U-Boot ------------------ The mpc7448hpc2 code base is known to compile using: Binutils 2.15, Gcc 3.4.3, Glibc 2.3.3 $ make mpc7448hpc2_config Configuring for mpc7448hpc2 board... $ make Memory Map ---------- The memory map is setup for Linux to operate properly. The mapping is: Range Start Range End Definition Size 0x0000_0000 0x7fff_ffff DDR 2G 0xe000_0000 0xe7ff_ffff PCI Memory 128M 0xfa00_0000 0xfaff_ffff PCI IO 16M 0xfb00_0000 0xfbff_ffff PCI Config 16M 0xfc00_0000 0xfc0f_ffff NVRAM/CADMUS 1M 0xfe00_0000 0xfeff_ffff PromJet 16M 0xff00_0000 0xff80_0000 FLASH (boot flash) 8M 0xff80_0000 0xffff_ffff FLASH (second half flash) 8M Using Flash ----------- The MPC7448hpc2 board has two "banks" of flash, each 8MB in size (2^23 = 0x00800000). Note: the "bank" here refers to half of the flash. In fact, there is only one bank of flash, which is divided into low and high half. Each is controlled by the most significant bit of the address bus. The so called "bank" is only for convenience. There is a switch which allows the "bank" to be selected. The switch settings for updating flash are given below. The u-boot commands for copying the boot-bank into the secondary bank are as follows: erase ff800000 ff880000 cp.b ff000000 ff800000 80000 U-boot commands for downloading an image via tftp and flashing it into the secondary bank: tftp 10000 <u-boot.bin.image> erase ff000000 ff080000 cp.b 10000 ff000000 80000 After copying the image into the second bank of flash, be sure to toggle SW3[4] on board before resetting the board in order to set the secondary bank as the boot-bank. Board Switches ---------------------- Most switches on the board should not be changed. The most frequent user-settable switches on the board are used to configure the flash banks and determining the PCI frequency. SW1[1-5]: Processor core voltage 12345 Core Voltage ----- SW1=01111 1.000V. SW1=01101 1.100V. SW1=01011 1.200V. SW1=01001 1.300V only for MPC7447A. SW2[1-6]: CPU core frequency CPU Core Frequency (MHz) Bus Frequency 123456 100 133 167 200 Ratio ------ SW2=101100 500 667 833 1000 5x SW2=100100 550 733 917 1100 5.5x SW2=110100 600 800 1000 1200 6x SW2=010100 650 866 1083 1300 6.5x SW2=001000 700 930 1167 1400 7x SW2=000100 750 1000 1250 1500 7.5x SW2=110000 800 1066 1333 1600 8x SW2=011000 850 1333 1417 1700 8.5x only for MPC7447A SW2=011110 900 1200 1500 1800 9x This table shows only a subset of available frequency options; see the CPU hardware specifications for more information. SW2[7-8]: Bus Protocol and CPU Reset Option 7 - SW2=0 System bus uses MPX bus protocol SW2=1 System bus uses 60x bus protocol 8 - SW2=0 TSI108 can cause CPU reset SW2=1 TSI108 can not cause CPU reset SW3[1-8] system options 123 --- SW3=xxx Connected to GPIO[0:2] on TSI108 4 - SW3=0 CPU boots from low half of flash SW3=1 CPU boots from high half of flash 5 - SW3=0 SATA and slot2 connected to PCI bus SW3=1 Only slot1 connected to PCI bus 6 - SW3=0 USB connected to PCI bus SW3=1 USB disconnected from PCI bus 7 - SW3=0 Flash is write protected SW3=1 Flash is NOT write protected 8 - SW3=0 CPU will boot from flash SW3=1 CPU will boot from PromJet SW4[1-3]: System bus frequency Bus Frequency (MHz) --- SW4=010 183 SW4=011 100 SW4=100 133 SW4=101 166 only for MPC7447A SW4=110 200 only for MPC7448 others reserved SW4[4-6]: DDR2 SDRAM frequency Bus Frequency (MHz) --- SW4=000 external clock SW4=011 system clock SW4=100 133 SW4=101 166 SW4=110 200 others reserved SW4[7-8]: PCI/PCI-X frequency control 7 - SW4=0 PCI/PCI-X bus operates normally SW4=1 PCI bus forced to PCI-33 mode 8 - SW4=0 PCI-X mode at 133 MHz allowed SW4=1 PCI-X mode limited to 100 MHz