2013/11/11 Gabor Juhos juhosg@openwrt.org:
2013.11.11. 20:36 keltezéssel, Daniel Schwierzeck írta:
2013/11/11 Gabor Juhos juhosg@openwrt.org:
The relocation code uses the CONFIG_SYS_MONITOR_BASE constant for calculating the reserved memory size and relocation offset values. Along with these predefined values the code also uses several other constants which are computed by the linker from the CONFIG_SYS_TEXT_BASE value. Due to this, the relocation code works incorreclty if the CONFIG_SYS_TEXT_BASE and CONFIG_SYS_MONITOR_BASE values are different.
to be consistent with all other architectures, we should keep CONFIG_SYS_MONITOR_BASE. I think it is neither valid nor intentional to use a value different from CONFIG_SYS_TEXT_BASE.
If it is neither valid nor intentional, the CONFIG_SYS_MONITOR_BASE constant should not exist at all and CONFIG_SYS_TEXT_BASE should be used everywhere instead IMHO.
By now it is redundant. Once CONFIG_SYS_TEXT_BASE was only a make variable named TEXT_BASE and defined in board-specific config.mk. This has been converted with commit 14d0a02a168b36e87665b8d7f42fa3e88263d26d.
BTW the README states:
- CONFIG_SYS_MONITOR_BASE: Physical start address of boot monitor code (set by make config files to be same as the text base address (CONFIG_SYS_TEXT_BASE) used when linking) - same as CONFIG_SYS_FLASH_BASE when booting from flash.
Additionally, we have this check in arch/mips/lib/board.c:
#if CONFIG_SYS_MONITOR_BASE == CONFIG_SYS_FLASH_BASE bd->bi_flashoffset = monitor_flash_len; /* reserved area for U-Boot */ #else bd->bi_flashoffset = 0; #endif
If it is not allowed to use different values for the two constants, the condition and the #else branch should be removed.
no that is still needed if a board has NOR flash but boots from NAND or SPI flash or other media (e.g. SoC evaluation boards). In that case CONFIG_SYS_TEXT_BASE points usually to an SRAM address.
Instead we should change include/configs/malta.h:
-#define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_FLASH_BASE +#define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_TEXT_BASE
Comments?
I have tried this already. It is working as well, however with this change the flash sectors containing the bootloader are not protected correctly:
malta # flinfo
Bank # 1: CFI conformant flash (32 x 32) Size: 4 MB in 64 Sectors Intel Extended command set, Manufacturer ID: 0x00, Device ID: 0x00 Erase timeout: 16384 ms, write timeout: 3 ms Buffer write timeout: 3 ms, buffer size: 2048 bytes
Sector Start Addresses: BE000000 BE010000 BE020000 BE030000 BE040000 BE050000 BE060000 BE070000 BE080000 BE090000 BE0A0000 BE0B0000 BE0C0000 BE0D0000 BE0E0000 BE0F0000 BE100000 BE110000 BE120000 BE130000 BE140000 BE150000 BE160000 BE170000 BE180000 BE190000 BE1A0000 BE1B0000 BE1C0000 BE1D0000 BE1E0000 BE1F0000 BE200000 BE210000 BE220000 BE230000 BE240000 BE250000 BE260000 BE270000 BE280000 BE290000 BE2A0000 BE2B0000 BE2C0000 BE2D0000 BE2E0000 BE2F0000 BE300000 BE310000 BE320000 BE330000 BE340000 BE350000 BE360000 BE370000 BE380000 BE390000 BE3A0000 BE3B0000 BE3C0000 BE3D0000 BE3E0000 RO BE3F0000 RO malta #
For reference, this is the output of flinfo with my change:
malta # flinfo
Bank # 1: CFI conformant flash (32 x 32) Size: 4 MB in 64 Sectors Intel Extended command set, Manufacturer ID: 0x00, Device ID: 0x00 Erase timeout: 16384 ms, write timeout: 3 ms Buffer write timeout: 3 ms, buffer size: 2048 bytes
Sector Start Addresses: BE000000 RO BE010000 RO BE020000 RO BE030000 BE040000 BE050000 BE060000 BE070000 BE080000 BE090000 BE0A0000 BE0B0000 BE0C0000 BE0D0000 BE0E0000 BE0F0000 BE100000 BE110000 BE120000 BE130000 BE140000 BE150000 BE160000 BE170000 BE180000 BE190000 BE1A0000 BE1B0000 BE1C0000 BE1D0000 BE1E0000 BE1F0000 BE200000 BE210000 BE220000 BE230000 BE240000 BE250000 BE260000 BE270000 BE280000 BE290000 BE2A0000 BE2B0000 BE2C0000 BE2D0000 BE2E0000 BE2F0000 BE300000 BE310000 BE320000 BE330000 BE340000 BE350000 BE360000 BE370000 BE380000 BE390000 BE3A0000 BE3B0000 BE3C0000 BE3D0000 BE3E0000 RO BE3F0000 RO malta #
Any idea how can we resolve this properly?
-Gabor
following seems to work (in both variants with -bios and -pflash)
#define CONFIG_SYS_TEXT_BASE 0xbe000000 #define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_TEXT_BASE