skyeye对S3C2410的Nand Flash模拟支持到什么程度？
最近想学习给U-BOOT添加Nand Flash启动的支持。之前在网上搜了不少资料，但u-boot及skseye的版本都比较老，属于老皇历帖了:( (U-boot V1.1.4、skyeye V1.2.2)于是想在当前新版本之下来添加U-boot对Nand Flash的支持(u-boot V1.3.4、skyeye V1.2.5)，在前人的基础上举一反三，与时俱进:mrgreen:
但是经实践发现，skyeye模拟的s3c2410 nand controller似乎并不是完全忠实于硬件:(
具体实验如下：
# /opt/skyeye/bin/skyeye -h
SkyEye 1.2.5
......
# ls
skyeye.confsrcu-boot-1.3.4u-boot.binu-boot.nand
# cat skyeye.conf
cpu:arm920t
mach: s3c2410x
# physical memory
mem_bank:map=M, type=RW, addr=0x00000000, size=0x00020000, file=u-boot-1.3.4/u-boot.bin, boot=yes # 64K
mem_bank:map=M, type=RW, addr=0x30000000, size=0x0f000000
# I/O mapping area
mem_bank:map=I, type=RW, addr=0x48000000, size=0x20000000
mem_bank:map=I, type=RW, addr=0x19000300, size=0x00000020
#net: type=cs8900a, base=0x19000300, size=0x20, int=9, mac=08:00:3E:26:0A:5B, ethmod=tuntap, hostip=10.0.0.1
#lcd:state=on,type=s3c2410x, mod=gtk
nandflash: type=s3c2410x, name=K9F1208U0B, dump=./uboot.nand
# /opt/skyeye/bin/skyeye -d
**************************** WARNING **********************************
If you want to run ELF image, you should use -e option to indicate
your elf-format image filename. Or you only want to run binary image,
you need to set the filename of the image and its entry in skyeye.conf.
***********************************************************************
Your elf file is little endian.
arch: arm
cpu info: armv4, arm920t, 41009200, ff00fff0, 2
mach info: name s3c2410x, mach_init addr 0x8067224
nandflash: dump ./uboot.nand
file size:69206016
uart_mod:0, desc_in:, desc_out:, converter:
SKYEYE: use arm920t mmu ops
Loaded RAM u-boot-1.3.4/u-boot.bin
debugmode= 1, filename = skyeye.conf, server TCP port is 12345
(另一个终端起gdb)
# arm-linux-gdb
GNU gdb Red Hat Linux (6.3.0.0-1.21_3rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.Type "show warranty" for details.
This GDB was configured as "--host=i386-redhat-linux --target=arm-linux".
The target architecture is set automatically (currently arm)
(gdb) target remote 127.0.0.1:12345
Remote debugging using 127.0.0.1:12345
0x00000000 in ?? ()
(此时skyeye的终端输出)
Remote debugging using host:12345
(gdb终端继续)
(gdb) x/4w 0x4e000000 //0x4e00 0000也就是NFCONF寄存器
0x4e000000: 0xffffff00 0xffffff00 0xffffff00 0xffffff00
(gdb) p *0x4e000000=0x1006 //往NFCONF寄存器写入初始值，TACLS=1、TWRPH0=0、TERPH1=0、AdvFlash=0、PageSize=1、AddrCycle=1、BusWidth=0
$1 = 0xffffff06
(gdb) x/4w 0x4e000000 //再次读取NFCONF，只有低8位被有效写入
0x4e000000: 0xffffff06 0xffffff00 0xffffff00 0xffffff00
(此时skyeye的终端输出)
ERROR: s3c2410x_io_write_word(0x4e000001) = 0x00000010
ERROR: s3c2410x_io_write_word(0x4e000002) = 0x00000000
ERROR: s3c2410x_io_write_word(0x4e000003) = 0x00000000
此实验说明了skyeye模拟的NandFlash Controller的NFCONF寄存器仅有低8位可写，其余高位字节全都不可写入。(CPU UM上此为32位寄存器)
经全面测试，还有NFCONT同样只能写低8位。用作ECC校验的NFMECCD0、NFMECCD1、NFSECCD更是彻底不可读写。8O
综上，故有此一问。:?:
望达人或nand模拟实现者给与指点。
页:
[1]