Jatin Sharma wrote: > I am running U-Boot version U-Boot 1.3.1-rc1 on my board that has a > Broadcom network switch. My goal is to initialize this switch at the > bootloader level and be able to tftpboot a Linux kernel from one of > the ethernet ports of this switch. > > As _I_ understand, there are two ways to initialize the switch from u-boot. > > First > ===== > Theory: Link the switch driver software with the u-boot.bin and flash > it on the board. Switch driver's entry point would be called somewhere > in u-boot to initialize it. Size of the u-boot.bin will increase and > the u-boot partition on the NOR flash will need to be updated to > accommodate the new binary size. > > Practice: After I linked the driver software with the u-boot.bin, the > board didn't boot any further after u-boot got relocated to RAM with > this following message: > "Now running in RAM - U-Boot at: 0ff6d000" > > I did the following to link switch driver library (MDK_BLIBS) with > u-boot in Makefile: > > $(obj)u-boot: ......... > --start-group $(__LIBS) $(MDK_BLIBS)--end-group > $(PLATFORM_LIBS) \ > ......... > > Switch library is compiled with same TEXT_BASE and other flags as that > of u-boot. > > Second > ====== > Theory: Build the network switch driver as a u-boot application, flash > it on a free partition on the NOR and after u-boot has booted, it will > somehow do the following to initialize the network switch. > > cp.b 0xfff90000 0x40000 0x5bfac > go 0x00040418 > > Practice: The above two commands worked to initialize the switch. I > still need to understand how to run these command automatically after > the u-boot has booted. > > > Questions: > 1.) Which design is recommended, first or the second? Second is easier > for me to implement as I don't have to change the partition sizes but > could easily be overlooking some obvious problems. > It would help to know which type of Broadcom switch it is you're using. A lot of them have a SPI-based control plane, in which case you can set up a simple port configuration without an elaborate driver.
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