Dear All,
I would like to port a Uboot loader on T-Engine/SH7727 MS7727CP02 DevKit.
Here is the configuration of this board
Renesas Technology SH7727(SH3-DSP, internal clock 96MHz / external clock
48MHz)
Flash Memory: 8MB
SDRAM: 32MB
Memory map of overall system is shown as below.
0x00000000 +-------------------------------+--------
| User area (P0)|
0x10000000 +-------------------------------+
| (Unused) (P0)| Enabled as a virtual
memory
0x40000000 +-------------------------------+
| System / Common area(1) (P0)|
0x80000000 +-------------------------------+--------
| Physical memory area (P1) |
| (Cache On) |
0xa0000000 +-------------------------------+
| Physical memory area (P2) |
| (Cache Off) |
0xc0000000 +-------------------------------+--------
| System/Common area(2) (P3) | Enabled as a virtual
memory
0xe0000000 +-------------------------------+--------
| I/O area (P4) |
0xffffffff +-------------------------------+
Physical memory area (P1 area) memory map is shown as below.
0x80000000 +-------------------------------+--------
| ROM area(8MB) | Area 0
| (Unused area included) |
0x84000000 +-------------------------------+--------
| I/O area | Area 1-2
| (Not used as a general rule)|
0x8c000000 +-------------------------------+--------
| RAM area(64MB) | Area 3
0x90000000 +-------------------------------+--------
| I/O area | Area 4-7
| (Not used as a general rule)|
0xa0000000 +-------------------------------+--------
Here is configuration of UBoot
\board\ms7727se\config.mk : TEXT_BASE = 0x8DFC0000
\board\ms7727se\u-boot.lds
OUTPUT_FORMAT("elf32-sh-tkernel", "elf32-sh-tkernel", "elf32-sh-tkernel")
SECTIONS
{
. = 0x8C000000 + (32*1024*1024) - (256*1024);
\include\configs\ms7727se.h
/* MEMORY */
#define MS7720SE_SDRAM_BASE 0x8C000000
#define MS7720SE_FLASH_BASE_1 0x80000000 //0xA0000000
#define MS7720SE_FLASH_BANK_SIZE (8 * 1024 * 1024)
#define CFG_MEMTEST_START MS7720SE_SDRAM_BASE
#define CFG_MEMTEST_END (CFG_MEMTEST_START + (60 * 1024 * 1024))
#define CFG_SDRAM_BASE MS7720SE_SDRAM_BASE
#define CFG_SDRAM_SIZE (32 * 1024 * 1024)
#define CFG_LOAD_ADDR (CFG_SDRAM_BASE + 32 * 1024 * 1024)
#define CFG_MONITOR_BASE MS7720SE_FLASH_BASE_1
#define CFG_MONITOR_LEN (128 * 1024)
#define CFG_MALLOC_LEN (256 * 1024)
#define CFG_GBL_DATA_SIZE 256
#define CFG_BOOTMAPSZ (8 * 1024 * 1024)
/* FLASH */
#define CFG_FLASH_CFI
#define CFG_FLASH_CFI_DRIVER
#undef CFG_FLASH_QUIET_TEST
#define CFG_FLASH_EMPTY_INFO /* print 'E' for empty sector on flinfo */
#define CFG_FLASH_BASE MS7720SE_FLASH_BASE_1
Would you please help me have a look this setting?
1. Is this setting correct ? I am confusing about TEXT_BASE with
CFG_LOAD_ADDR. Here is definition
- CFG_FLASH_BASE:
Physical start address of Flash memory.
- CFG_MONITOR_BASE:
Physical start address of boot monitor code (set by
make config files to be same as the text base address
(TEXT_BASE) used when linking) - same as
CFG_FLASH_BASE when booting from flash.
If I am wrong, please tell me how to correct these setting.
2. "ld" T-Engine toolchain only supports elf32-sh-tkernel target, but
reference implementation (example) tell "elf32-sh-linux" is expected target.
Is the setting correct?
\board\ms7727se\u-boot.lds
Original :
OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux")
-> My changes
OUTPUT_FORMAT("elf32-sh-tkernel", "elf32-sh-tkernel", "elf32-sh-tkernel")
I am newbie in embedded system. I am appreciating your helping.
Thank you a lot.
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