Dear Wolfgang,
On 29/01/2013 10.48, Wolfgang Denk wrote:
Dear Luca Ellero,
In message 51078BFD.60906@gmail.com you wrote:
in U-Boot version 2012.10 I used to skip "relocate_code" setting CONFIG_SYS_TEXT_BASE to relocaddr (obtained from bdinfo command). This since some hardware is able to configure SDRAM and load U-Boot directly to SDRAM, so relocation is useless and time consuming.
You are wrong. relocation is not useless, even in your case. there are quite a number of configuration options that will put stuff above the U-Boot image, directly at the end of RAM (things like protected RAM, shared frame buffer, shared log buffer, etc.). In these cases, the relocation address may even be dynamic (i. e. depending on settings of environment variables, and thus unknown at compile time).
Now I'm using latest git version and this isn't working anymore. Can someone explain me way? And what is the suggested way to skip relocation now.
Don't.
Got your point ;-) Thanks I'm asking that since I'm digging on ARM SDRAM configuration and found a bug on getting top of SDRAM (where u-boot will be relocated).
On ARM architectures top of SDRAM will always be:
CONFIG_SYS_SDRAM_BASE + gd->ram_size
anyway this can be wrong since SDRAM can be composed by more that one bank in not-contiguous address space. (CONFIG_SYS_SDRAM_BASE + gd->ram_size) can land to not existent SDRAM addresses and can be very dangerous since it can potentially corrupt real SDRAM (in most cases SDRAM is aliased so writing to some not-existent address can write to real address).
My proposed patch is something like this: ---------------------------------------------------------
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c index cfe32cc..7525caf 100644 --- a/arch/arm/lib/board.c +++ b/arch/arm/lib/board.c @@ -333,7 +333,18 @@ void board_init_f(ulong bootflag) gd->ram_size -= CONFIG_SYS_MEM_TOP_HIDE; #endif
+#if defined(PHYS_SDRAM_2) && defined(PHYS_SDRAM_2_SIZE) + if ( CONFIG_NR_DRAM_BANKS > 1 && + (PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE) != PHYS_SDRAM_2 ) + addr = PHYS_SDRAM_2 + PHYS_SDRAM_2_SIZE; + else + addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size; +#else addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size; +#endif +
---------------------------------------------------------
I know that some arch use more than 2 banks but implementing all macros checks to PHYS_SDRAM_* leads to some macro hell. So the point here is:
if (n banks > 2) and they are not contiguous, relocate u-boot at the end of 2nd bank even if there are more than 2 banks.
Please suggest me if this is the right way to follow or suggest me some more appropriate way to correct this bug Thanks again Regards Luca Ellero