[U-Boot] [PATCH 0/5] fix the boot issue of Rockchip RK3036

[Andy Yan]

Hi Heiko:


On 2017年07月05日 03:54, Heiko Stübner wrote:
> Hi Andy,
>
> Am Montag, 3. Juli 2017, 16:02:59 CEST schrieb Andy Yan:
>> On 2017年06月30日 16:14, Dr. Philipp Tomsich wrote:
>>>> On 30 Jun 2017, at 09:47, Andy Yan <andy.yan at rock-chips.com> wrote:
>>>> As Kever mentioned in [0], the RK3036 based boards could't
>>>> bootup for a long time.
>>>> After a git bisect, I found the RK3036 SPL code size has
>>>> increased from patch [1] [2]. Before Tom's patch [1], the
>>>> SPL size is 3160 bytes, but it becomes 4080 bytes after [1]
>>>> applied. After a look at this patch, I realised I should
>>>> disable SPL_USE_ARCH_MEMCPY/MEMSET, and the code size indeed
>>>> come down after I disabled them. But I got a LD error after
>>>> apply patch[2]: "undefined reference to memset", RK3036 SPL
>>>> didn't use lib/string because of the sram space imitation.
>>>> The compile succeed after CONFIG_SPL_LIBGENERIC_SUPPORT enabled,
>>>> but the spl code size become 3248 bytes.
>>>>
>>>> Additionally, Simon post patch [3] call printf to print a
>>>> message before back to bootrom from spl, which make the spl
>>>> code size increased to nearly 3.7 kb.
>>>>
>>>> RK3036 SPL only has 4kb sram to use, the spl code will use
>>>> 3.4 ~ 3.5 kb, the last 0.5kb are used for SP and GD, so there
>>>> is no space for malloc.
>>> gcc-6-arm-linux-gnueabi
>>> What version of GCC are you using?
>>> If your problem can also be solved by moving to GCC 6.3 (or newer) and
>>> the code-size improvements there, I’d rather just require a more recent
>>> GCC version.
>>       I default use arm-linux-gnueabe-gcc v5.4.
>>       The current upstream kylin-rk3036_defconfig compiled by gcc-5.4 is
>> 4384 bytes, the size comes down to 3936 bytes if I use
>> arm-linux-gnueabihf-gcc v6.3 from linaro. But this is still too large
>> for rk3036.
>>       Disable SPL_USE_ARCH_MEMCPY/MEMSET will make the spl size comes
>> down to 3042 bytes by gcc v6.3. But I still need some hack: enable
>> CONFIG_SPL_LIBGENERIC to get support for memset, masks Simon's print in
>> bootrom.c, or the code size will become very large. Event though this
>> hack make things work, we still lost a few hundreds bytes by function
>> board_init_f_alloc_reserve, because platforms with very limit sram like
>> rk3036 will return to bootrom after the dram initialized, they never use
>> the malloc space. This few hundreds bytes is a large space for 4kb
>> sarm,  it's better to letf them for code or SP.Heiko
> For a start, maybe you could take a look at Simon's size reduction
> series from april. The TPL-specific stuff may not be that interesting,
> but the first patch adds a totally slimmed down memset, which
> may be better for real hard size constraints
>
> [PATCH v2 0/5] Patches to reduce TPL code size:
> https://www.mail-archive.com/u-boot@lists.denx.de/msg243443.html

     The SPL_TINY_MEMSET was included in my hack.
>
>
> Heiko
>
>
>
>