[U-Boot-Users] [uboot] Walnut PPC405GP flash

[甜瓜]

Howdy,
    I'm a beginner of embedded system. I'm working on a board of Walnut
PPC405GP which use PPCBOOT 1.1.2.
One day I tried to write some data into unused area of the flash:

>> fli
Bank # 1: AMD AM29F040 (512 Kbit, uniform sector size)
  Size: 512 KB in 8 Sectors
  Sector Start Addresses:
    FFF80000  RO  FFF90000  RO  FFFA0000  RO  FFFB0000      FFFC0000
    FFFD0000      FFFE0000      FFFF0000

I use the last sector:
>> md ffff0000
ffff0000: 00000000 00000000 00000000 00000000    ................
ffff0010: 00000000 00000000 00000000 00000000    ................
ffff0020: 00000000 00000000 00000000 00000000    ................
ffff0030: 00000000 00000000 00000000 00000000    ................
ffff0040: 00000000 00000000 00000000 00000000    ................
ffff0050: 00000000 00000000 00000000 00000000    ................
ffff0060: 00000000 00000000 00000000 00000000    ................
ffff0070: 00000000 00000000 00000000 00000000    ................
ffff0080: 00000000 00000000 00000000 00000000    ................
ffff0090: 00000000 00000000 00000000 00000000    ................
ffff00a0: 00000000 00000000 00000000 00000000    ................
ffff00b0: 00000000 00000000 00000000 00000000    ................
ffff00c0: 00000000 00000000 00000000 00000000    ................
ffff00d0: 00000000 00000000 00000000 00000000    ................
ffff00e0: 00000000 00000000 00000000 00000000    ................
ffff00f0: 00000000 00000000 00000000 00000000    ................

>> protected off ffff0000 ffffffff
Un-Protected 1 sectors
>> erase ffff0000 ffffffff
Erase Flash from 0xffff0000 to 0xffffffff
Erasing sector ffff0000
. done
Erased 1 sectors

!! Now I tried to copy a small file data to this area by using tftp.
>> tftp ffff0000 data_file
405GP Eth Status:
   data len error 0
   rx frames 0
   rx 0
   rx_prot_err 0
   int_err 0
   tx_err_log:
      [0] 0
      [1] 0
      [2] 0
      [3] 0
      [4] 0
      [5] 0
      [6] 0
      [7] 0
      [8] 0
      [9] 0
   rx_err_log:
      [0] 0
      [1] 0
      [2] 0
      [3] 0
      [4] 0
      [5] 0
      [6] 0
      [7] 0
      [8] 0
      [9] 0

ENET Speed is 100 Mbps - FULL duplex connection
*** ERROR: `ipaddr' not set
Well, set the target addr first, then:

>> dhcp
405GP Eth Status:
   data len error 0
   rx frames 0
   rx 0
   rx_prot_err 0
   int_err 0
   tx_err_log:
      [0] 0
      [1] 0
      [2] 0
      [3] 0
      [4] 0
      [5] 0
      [6] 0
      [7] 0
      [8] 0
      [9] 0
   rx_err_log:
      [0] 0
      [1] 0
      [2] 0
      [3] 0
      [4] 0
      [5] 0
      [6] 0
      [7] 0
      [8] 0
      [9] 0

ENET Speed is 100 Mbps - FULL duplex connection
BOOTP broadcast 1
DHCPHandler: got packet: (src=67, dst=68, len=548) state: 3
Filtering pkt = 0
DHCPHandler: got DHCP packet: (src=67, dst=68, len=548) state: 3
DHCP: state=SELECTING bp_file: "uImage"
TRANSITIONING TO REQUESTING STATE
Bootfile: uImage
DhcpSendRequestPkt: Sending DHCPREQUEST
Transmitting DHCPREQUEST packet: len = 308
DHCPHandler: got packet: (src=67, dst=68, len=548) state: 4
Filtering pkt = 0
DHCPHandler: got DHCP packet: (src=67, dst=68, len=548) state: 4
DHCP State: REQUESTING
Bootfile: uImage
DHCP client bound to address 192.168.1.201
ARP broadcast 1
Got good ARP - start TFTP
TFTP from server 192.168.1.200; our IP address is 192.168.1.201
Filename 'uImage'.
Load address: 0xffff0000
Loading: *##############NIP: 00000200 XER: 00000000 LR: 67E12A71 REGS:
01faea48 TRAP: 0700 DAR: 00080000
MSR: 00000000 EE: 0 PR: 0 FP: 0 ME: 0 IR/DR: 00

GPR00: 00000001 01FAEB38 40000000 01FAEB48 80000000 00000002 01FB016D
01C80764
GPR08: 01FF5060 01FF5074 FFFFFFFF 01FF54B4 00000000 7C6BFE6C 01FF4400
02050000
GPR16: E45EA284 DC212086 02CACA22 F3844306 00001000 01FAEB38 00000000
67E12A71
GPR24: 76585F5E 00000001 00000000 01FAEF8C 00000004 00000000 01FF44CC
01FF52A4
** Illegal Instruction **
Call backtrace:
Program Check Exception

 ========================
You can see my mistake...>_< A big uImage file is copied to flash, rather
than data_file.
After that, the Walnut board cannot boot anymore... I wonder why. The data
is simply copied to
the unused sector, while other sectors are under protection. It should be
safe even if I made mistakes.

Thank you very much.
---
ShenLei
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