Re: i.MX35 3-stack use only 128MB RAM

[Thomas Mayer <tm.telemotive@gmx.de>]

Hi,

the fact that Freescale's support really supports is new for me... :D :D
I heard/read so many times that I shouldn't expect support from freescale.

Regards,
Thomas


Am 20.04.2011 14:10, schrieb Boaz Ben-David:
> Hi,
>
> I'm glad it's helpful to you.
> I don't want to take the credit here, I forgot to write this is
> the procedure we got from Freescale's support when we contacted them.
> Sorry for not mentioning this at first, I thought I did... (:
>
>
> Boaz Ben-David
> R&D Engineer
>
> Tel: +972.2.6470.700Mob: +972.54.678.1511Email: boaz.bd@wellsense-tech.com
> www.themapsystem.com
>
>
>   Please consider the impact on the environment before printing this e-mail and/or the attachment(s).
> ________________________________________
> From: barebox-bounces@lists.infradead.org [barebox-bounces@lists.infradead.org] On Behalf Of Thomas Mayer [tm.telemotive@gmx.de]
> Sent: Wednesday, April 20, 2011 3:06 PM
> To: barebox@lists.infradead.org
> Subject: Re: i.MX35 3-stack use only 128MB RAM
>
> Hi,
>
> wow this was a really quick and good answer, thanks a lot!
> I will test it and try to adapt it to barebox too.
>
>
> Regards,
> Thomas
>
>
> Am 20.04.2011 13:20, schrieb Boaz Ben-David:
>> Hi,
>>
>> This is the procedure for modifying Redboot to support 256MB of RAM in Redboot, you can adapt it to barebox:
>>
>> How to extend RAM for Linux on MX35PDK
>> =======================================
>>
>> Tested on: redboot_200910, MX35PDK green board, MX35 TO2, DDR2, SDK1.5
>>
>> The current redboot images enable just half of the physically available DDR2 memory (128MB on MX35PDK).
>> This is due to the fact that redboot is only enabling SDCS0 (BANK0) and not SDCS1.
>> It seems that there was a little bug in redboot which has prevented the enablement of SDCS1 and so
>> nobody has tried this again. Physically the bank1 is working properly on MX35PDK CPU module.
>>
>> Step0
>> =====
>>
>> Check memory size of existing redboot on your MX35PDK
>>
>> under redboot check memory on SDCS1 which is mapped physically to 0x90000000.
>> You may also use 0x08000000 which is the first virtual address on SDCS1.
>> Note in redboot, the virtual address 0x80000000 is mapped to physical address 0x80000000 non cashable.
>> Virtual Address 0x0 is mapped to physical address 0x80000000 cashable.
>> The virtual address 0x90000000 is not in the MMU table. That is why we receive a "illegal memory address" error message.
>>    This is not a memory exception because no memory transaction has  taken place.
>> See also below...
>>
>>
>> RedBoot>   dump -b 0x90000000
>> 90000000: ** command abort - illegal memory access?
>> RedBoot>   dump -b 0x08000000
>> 08000000: ** command abort - illegal memory access?
>> RedBoot>   dump -b 0x07ffff00
>> 07FFFF00: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF  |................|
>> 07FFFF10: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF  |................|
>>
>> After booting linux use command "free":
>>
>> root@freescale ~$ free
>>                 total         used         free       shared      buffers
>>     Mem:       126140         9920       116220            0            0
>>    Swap:            0            0            0
>> Total:       126140         9920       116220
>>
>> You have about 128MB free memory. But not 256MB.
>>
>>
>> Step 1
>> ======
>>
>> We will edit and recompile redboot. For this you may untar the redboot_200910.tgz archive in the linux BSP source
>> on your linux host.
>> Unpack redboot and configure the build process as described in
>> redboot_200910/doc/redboot_mx35.pdf Chapter 6
>>
>> You should be able to run successfully:
>>
>>               ecosconfig new mx35_3stack redboot
>>               ecosconfig import $ECOS_REPOSITORY/hal/arm/mx35/3stack/current/misc/redboot_ROMRAM.ecm
>>               ecosconfig tree
>>               make
>>
>> Step 2
>> ======
>>
>> We will know edit some redboot source files as discribed below. Look at the comment
>> "// by michael for 256MB".
>>
>>
>> ~/redboot_200910/src/ecos/packages/hal/arm/mx35/3stack/current/include/pkgconf/mlt_arm_board_romram.h
>>
>> #ifndef __ASSEMBLER__
>> #include<cyg/infra/cyg_type.h>
>> #include<stddef.h>
>>
>> #endif
>> #define CYGMEM_REGION_ram (0x00000000)
>> #define CYGMEM_REGION_ram_SIZE (0x0FF00000) // by michael for 256MB
>> #define CYGMEM_REGION_ram_ATTR (CYGMEM_REGION_ATTR_R | CYGMEM_REGION_ATTR_W)
>> #define CYGMEM_REGION_rom (0x87F00000)
>> #define CYGMEM_REGION_rom_SIZE (0x100000)
>> #define CYGMEM_REGION_rom_ATTR (CYGMEM_REGION_ATTR_R)
>> #ifndef __ASSEMBLER__
>> extern char CYG_LABEL_NAME (__heap1) [];
>> #endif
>> #define CYGMEM_SECTION_heap1 (CYG_LABEL_NAME (__heap1))
>> #define CYGMEM_SECTION_heap1_SIZE (CYGMEM_REGION_ram_SIZE - (size_t) CYG_LABEL_NAME (__heap1))
>>
>>
>> ~/redboot_200910/src/ecos/packages/hal/arm/mx35/3stack/current/include/hal_plaform_setup.h line 712:
>>
>>          ldr r0, ESDCTL_BASE_W
>> /* deleted by michael
>>           mov r3, #0x2000
>>           str r3, [r0, #0x0]
>>           ldr r2, ROM_VER_ADDR_W
>>           ldr r4, [r2]
>>           cmp r4, #0x1
>>           streq r3, [r0, #0x8]
>> */
>>    mov r12, #0x00
>>    mov r2, #0x0 // DDR2
>>    mov r1, #RAM_BANK0_BASE
>>    bl setup_sdram_bank
>>    cmp r3, #0x0
>> 3: bne 3b  // loop forever if bank0 is not OK
>>
>> /* do not repeat with mDDR settings. We know we have DDR2 (r2=0)
>>    cmp r3, #0x0
>>    orreq r12, r12, #1
>>    eorne r2, r2, #0x1
>>    blne setup_sdram_bank
>> */
>> #if 1 // do the same for bank1
>>    /* CSD1 */
>>    mov r12, #0x00
>>    mov r2, #0x0 // DDR2
>>    mov r1, #RAM_BANK1_BASE
>>    bl setup_sdram_bank
>>    cmp r3, #0x0
>> 4: bne 4b  //loop forever if bank1 is not OK
>>
>>
>> /* do not try with mDDR again for bank1. we know we have DDR2
>>    beq 1b
>>    eorne r2, r2, #0x1
>>    blne setup_sdram_bank
>>    orr r12, r12, #1
>> 1:
>> */
>> #endif
>>
>> ~/redboot_200910/src/ecos/packages/hal/arm/mx35/3stack/current/include/fsl_board.h
>>
>> /* MX35 3-Stack SDRAM is from 0x90000000, 64M */
>> #define SDRAM_BASE_ADDR             CSD0_BASE_ADDR
>> //#define SDRAM_SIZE                  0x08000000
>> #define SDRAM_SIZE                  0x10000000   // by michael for 256MB
>> #define RAM_BANK0_BASE              CSD0_BASE_ADDR
>> #define RAM_BANK1_BASE              CSD1_BASE_ADDR
>>
>>
>> ~/redboot_200910/src/ecos/packages/hal/arm/mx35/3stack/current/src/board_misc.c
>>
>>      /*              Actual   Virtual  Size   Attributes                                                    Function  */
>>       /*              Base     Base     MB     cached?           buffered?        access permissions                 */
>>       /*              xxx00000 xxx00000                                                                                */
>>       X_ARM_MMU_SECTION(0x000, 0xF00,   0x1,   ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* ROM */
>>       X_ARM_MMU_SECTION(0x100, 0x100,   0x1,   ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* iRAM */
>>       X_ARM_MMU_SECTION(0x300, 0x300,   0x1,   ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* L2CC */
>>       X_ARM_MMU_SECTION(0x400, 0x400,   0x400, ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* Internal Regsisters upto SDRAM*/
>>       X_ARM_MMU_SECTION(0x800, 0x000,   0x80,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* SDRAM 0:128M*/
>>       X_ARM_MMU_SECTION(0x800, 0x800,   0x80,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* SDRAM 0:128M*/
>>       X_ARM_MMU_SECTION(0x800, 0x880,   0x80,  ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* SDRAM 0:128M*/
>>       // start by michael for 256MB. Enter new MMU entries for SDCS1
>>       X_ARM_MMU_SECTION(0x900, 0x080,   0x80,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* SDRAM 1:128M*/
>>       X_ARM_MMU_SECTION(0x900, 0x900,   0x80,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* SDRAM 1:128M*/
>>       X_ARM_MMU_SECTION(0x900, 0x980,   0x80,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* SDRAM 1:128M*/
>>       // end by michael for 256MB
>>       X_ARM_MMU_SECTION(0xA00, 0xA00,   0x40,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* Flash */
>>       X_ARM_MMU_SECTION(0xB00, 0xB00,   0x20,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); /* PSRAM */
>>       X_ARM_MMU_SECTION(0xB20, 0xB20,   0x1E0, ARM_UNCACHEABLE, ARM_UNBUFFERABLE,ARM_ACCESS_PERM_RW_RW); /* ESDCTL, WEIM, M3IF, EMI, NFC, External I/O */
>>
>>
>> Step 4
>> ======
>>
>> rebuild redboot. Now it comes:
>>
>> The make scripte does not recognize any changes in hal_platform_setup.h file because this file is been used to build
>> the lib "vectors". This is not in the dependencies of the make script. It is either not removed by "make clean".
>> You have to remove the vectors.o by hand.
>>
>> So to properly rebuild redboot you need to:
>>
>> cd ~/redboot_200910/src/ecos
>> rm install/lib/vectors.*
>> make
>> cp install/bin/redboot.bin ~/shared_folder/redboot_mx35_TO2_256MB.bin # if you have a VMWare and use a shared_folder in ~/shared_folder
>>
>>
>> Step 5
>> ======
>>
>> Flash new redboot to MX35PDK using ATK1.6. You do not need to erase the NAND flash. So, you keep the
>> same fconfig settings. Do not forget the BBT tick!
>>
>>
>> Step 6
>> ======
>>
>> Check the new memories:
>>
>> RedBoot>   dump -b 0x90000000
>> 90000000: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
>> 90000010: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
>>
>>
>> root@freescale ~$ free
>>                 total         used         free       shared      buffers
>>     Mem:       256088        10040       246048            0            0
>>    Swap:            0            0            0
>> Total:       256088        10040       246048
>>
>>
>>
>>
>> Boaz Ben-David
>> R&D Engineer
>>
>> Tel: +972.2.6470.700Mob: +972.54.678.1511Email: boaz.bd@wellsense-tech.com
>> www.themapsystem.com
>>
>>
>>    Please consider the impact on the environment before printing this e-mail and/or the attachment(s).
>> ________________________________________
>> From: barebox-bounces@lists.infradead.org [barebox-bounces@lists.infradead.org] On Behalf Of Thomas Mayer [thomas.mayer@telemotive.de]
>> Sent: Wednesday, April 20, 2011 1:56 PM
>> To: barebox@lists.infradead.org
>> Subject: i.MX35 3-stack use only 128MB RAM
>>
>> Hi,
>>
>> I read in the freescale documentation "U-Boot for i.MX35 based Designs"
>> that the i.MX35 3-stack board has 256MB SDRAM, but we can use only 128MB
>> because the second chip select isn't configured. Depending on the
>> circuit diagrams I think "CSD1" isn't configured.
>> I looked already in the datasheet of the cpu, but I couldn't found a
>> solution for this problem.
>>
>> Have anybody ever tried to enable this second chip select?
>>
>>
>> Regards,
>> Thomas
>>
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