[PATCH v2] Add support for Baltos systems

[Yegor Yefremov]

On Wed, Jun 1, 2016 at 9:08 AM, Sascha Hauer <s.hauer at pengutronix.de> wrote:
> On Mon, May 30, 2016 at 04:43:50PM +0200, yegorslists at googlemail.com wrote:
>> From: Yegor Yefremov <yegorslists at googlemail.com>
>>
>> OnRISC Baltos devices are based on a am335x SoC and can be booted
>> either from MMC or NAND.
>>
>> Signed-off-by: Yegor Yefremov <yegorslists at googlemail.com>
>> ---
>> Changes:
>>         v2: - remove typedef
>>             - rework invalid EEPROM content handling
>>             - add mmc0 as boot device for MMC boot source
>>
>> +static int baltos_mem_init(void)
>> +{
>> +     uint32_t sdram_size;
>> +
>> +     if (!of_machine_is_compatible("vscom,onrisc"))
>> +             return 0;
>> +
>> +     sdram_size = SZ_256M;
>> +
>> +     arm_add_mem_device("ram0", 0x80000000, sdram_size);
>> +
>> +     return 0;
>> +}
>> +mem_initcall(baltos_mem_init);
>
> This shouldn't be necessary. See arch/arm/mach-omap/am33xx_scrm.c, here
> the correct amount of memory should be registered.

ACK

>> +ENTRY_FUNCTION(start_am33xx_baltos_sdram, r0, r1, r2)
>> +{
>> +     uint32_t sdram_size;
>> +     void *fdt;
>> +
>> +     sdram_size = SZ_256M;
>> +     fdt = __dtb_am335x_baltos_minimal_start;
>> +
>> +     fdt -= get_runtime_offset();
>> +
>> +     barebox_arm_entry(0x80000000, sdram_size, fdt);
>
> am335x_barebox_entry() calculates the SDRAM size automatically for you.
>
> Doing this has the advantage that you can configure your SDRAM as you
> like without having to bother that all other locations where the SDRAM
> size is needed are correct.

This is not working for me. As soon as barebox.bin starts I can see only

barebox 2016.05.0 #3 Mon Jun 13 09:32:01 CEST 2016

Board: OnRISC Baltos

I don't know why, but am335x_sdram_size() always finds 0x20000000 i.e.
512MB on both 256MB modules and 512MB.

I understand only main railway station :-)

Yegor