6.2. U-Boot Download Details

6.2.1. Find out where to download to (memory map)

• RAM:   0x00000000 ...
• Flash: 0xFF000000 ...
• Begin of U-Boot image: Begin of Flash
• Size of U-Boot image: approx. 120 kb, reserved: 256 kB

6.2.2. Find out how flash memory is structured (erase blocks)

• ATC board uses AMD 29LV641D flash chips (64 Mbit, uniform sectors)
• all erase blocks (sectors) = 64 kB

6.2.3. Use BDI2000 to erase flash and program the image

• Check where flash (=boot device) is mapped after reset

  ATC>rd br0
  br0: 0x00001001  4097
  

  => =BR0[BA] = 0x00000000

• Erase first 256 kB (= first 4 sectors)

  ATC>era 0
  Erasing flash at 0x00000000
  Erasing flash passed
  ATC>era 0x10000
  Erasing flash at 0x00010000
  Erasing flash passed
  ATC>era 0x20000
  Erasing flash at 0x00020000
  Erasing flash passed
  ATC>era 0x30000
  Erasing flash at 0x00030000
  Erasing flash passed
  

• Program U-Boot binary image starting at address 0x00000000

  ATC>prog 0x00000000 /tftpboot/ATC/u-boot.bin-wd bin
  Programming /tftpboot/ATC/u-boot.bin-wd , please wait ....
  Programming flash passed
  

• Start U-Boot image

  ATC>reset
  - TARGET: processing user reset request
  - BDI asserts HRESET
  - Reset JTAG controller passed
  - Bypass check: 0x55 => 0xAA
  - Bypass check: 0x55 => 0xAA
  - JTAG exists check passed
  - Target PVR is 0x80911014
  - COP status is 0x01
  - Check running state passed
  - BDI scans COP freeze command
  - BDI removes HRESET
  - COP status is 0x05
  - Check stopped state passed
  - Check LSRL length passed
  - BDI sets breakpoint at 0x00000100
  - BDI resumes program execution
  - Waiting for target stop passed
  - TARGET: Target PVR is 0x80911014
  - TARGET: resetting target passed
  - TARGET: processing target startup ....
  - TARGET: processing target startup passed
  ATC>go
  

6.2.4. Fine tuning the BDI2000 config file

• Set defaults for flash sectors to erase and image to program

  [FLASH]
  ...
  FILE        /tftpboot/ATC/u-boot.bin
  FORMAT      BIN  0x00000000
  ERASE       0x00000000 BLOCK
  ERASE       0x00010000 BLOCK
  ERASE       0x00020000 BLOCK
  ERASE       0x00030000 BLOCK
  

• Now use simple commands

  ATC>era  
  Erasing flash at 0x00000000
  Erasing flash at 0x00010000
  Erasing flash at 0x00020000
  Erasing flash at 0x00030000
  Erasing flash passed
  ATC>prog
  Programming /tftpboot/ATC/u-boot.bin , please wait ....
  Programming flash passed