[U-Boot-Users] Memory problems with u-boot in EP852T board (Embedded Planet)

[Moshe Menachem]

Hi All,

I'm porting u-boot to support the EP852T board of Embedded Planet(BUS @ 50MHz) .
I saw that there is no reference for using this specific kind of board , but only u-boot for RPXLite board .

I encountered a problem to configure the u-boot correctly to support memory operation for this board .
The EP 852T board uses a 8MB flash on CS0 (two chips of AMD - AM29LV320B, each is 4MB) and Micron SDRAM(MT48LC4M32B2) of 16MB on CS1 .

1. Does CFG_MAX_FLASH_SECT  71(the num of sectors in one AMD chip) includes both chips ?
    Which means does the u-boot/cpu see a 1 big flash of 8MB 32 bits bus with doubled size sector? instead of a 64KB size sectors(in a single AMD chip), a 128KB size   
    sectors?

2. According to the EP852T board user manual, the 8MB flash base address starts at 0xff800000 (=CFG_FLASH_BASE) .
    I configured: 
   CFG_FLASH_BASE	0xff800000
   CFG_MONITOR_BASE  CFG_FLASH_BASE
   CFG_BR0_PRELIM     0xff800001   (in order to support base address 0xff800000 for 8MB Flash size)
   CFG_OR0_PRELIM	0xff800140   (OR Address mask of 0xff8000 for 8MB flash @50MHz)

3. The SDRAM configuration :
    SDRAM_BASE_PRELIM	0x00000000	/* SDRAM base	*/
    SDRAM_MAX_SIZE		0x01000000	/* max 16 MB */
    CFG_PRELIM_OR_AM         0xfc000000
    CFG_OR_TIMING_SDRAM	0x00000E00
    CFG_OR1_PRELIM   ( CFG_PRELIM_OR_AM | CFG_OR_TIMING_SDRAM )
    CFG_BR1_PRELIM   ((SDRAM_BASE_PRELIM & BR_BA_MSK) | BR_MS_UPMA | BR_V )   		 (=0x00000081)
    

The problems i encountered :

1. Although the flash prelim and mask are conifgured as defined in the EP board manual, when running the u-boot flash_get_size() 
   it fails on reading Manufacturer ID.
   When i bypass the flash_get_size and choose manually, in the code, the AM29LV320B flash and its sectors(71) and size(8MB),
  later, in the u-boot monitor i cannot erase the flash (none of the u-boot erase options work), but i can only read its sectors content .
  i also see that most of its sectors are detected as protected :(using the "flinfo" command)

 Bank # 1: AMD AM29LV320B (32 Mbit, bottom boot sect)
  Size: 8 MB in 71 Sectors
  Sector Start Addresses:
    FF800000      FF804000      FF808000      FF80C000      FF810000     
    FF814000      FF818000      FF81C000      FF820000      FF840000 (RO)
    FF860000 (RO) FF880000 (RO) FF8A0000 (RO) FF8C0000 (RO) FF8E0000 (RO)
    FF900000 (RO) FF920000 (RO) FF940000 (RO) FF960000 (RO) FF980000 (RO)
    FF9A0000 (RO) FF9C0000 (RO) FF9E0000 (RO) FFA00000 (RO) FFA20000 (RO)
    FFA40000 (RO) FFA60000 (RO) FFA80000 (RO) FFAA0000 (RO) FFAC0000 (RO)
    FFAE0000 (RO) FFB00000 (RO) FFB20000 (RO) FFB40000 (RO) FFB60000 (RO)
    FFB80000 (RO) FFBA0000 (RO) FFBC0000 (RO) FFBE0000 (RO) FFC00000 (RO)
    FFC20000 (RO) FFC40000 (RO) FFC60000 (RO) FFC80000 (RO) FFCA0000 (RO)
    FFCC0000 (RO) FFCE0000 (RO) FFD00000 (RO) FFD20000 (RO) FFD40000 (RO)
    FFD60000 (RO) FFD80000 (RO) FFDA0000 (RO) FFDC0000 (RO) FFDE0000 (RO)
    FFE00000 (RO) FFE20000 (RO) FFE40000 (RO) FFE60000 (RO) FFE80000 (RO)
    FFEA0000 (RO) FFEC0000 (RO) FFEE0000 (RO) 01010101 (RO) 01010101 (RO)
    01F40000 (RO) FFF60000 (RO) FFF80000 (RO) FFFA0000 (RO) FFFC0000 (RO)
    FFFE0000 (RO)

2. The second problem i have is with the SDRAM operation .
    The SDRAM seems to work(read and write are possible) only when i use CFG_PRELIM_OR_AM   0xfc000000,
    although CFG_PRELIM_OR_AM should be configured to 0xff000000 , for 16MB SDRAM OR mask .

Thanks in advance, 
Moshiko
     

      




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