[PATHv11 26/43] configs/tbs2910_defconfig inc limit
Soeren Moch
smoch at web.de
Wed Dec 6 08:06:18 CET 2023
On 05.12.23 21:00, Maxim Uvarov wrote:
> On Wed, 6 Dec 2023 at 00:25, Soeren Moch <smoch at web.de> wrote:
>
> On 05.12.23 17:25, Maxim Uvarov wrote:
>> On Tue, 5 Dec 2023 at 21:49, Soeren Moch <smoch at web.de> wrote:
>>
>> On 05.12.23 14:15, Maxim Uvarov wrote:
>>> I think I solved the size issue on all the boards.
>>>
>>> Key changes:
>>> 1. remove compilation of original ping.c and tftp.c (tftp
>>> had also server code, so I will partially bring it back.)
>> Interesting.
>> @Tom: Is there other server code in u-boot, that is enabled
>> by default (and can be used to reclaim code space)?
>> Fur sure I do not need u-boot to act as server for tftp (maye
>> nfs, others).
>>
>>
>> Maybe I need to be more clear about this. reference to code from
>> tftp.c and ping.c exist in net.c, test/image/spl_load_net.c,
>> test.dm/dsa.c <http://test.dm/dsa.c>, test/dm/eth.c.
>> And even if that code is not used (replaced with lwip calls to
>> the same commands in my case) it adds additional size. Even
>> enabled LTO does not see
>> direct difference.
> So 'server code' does not mean u-boot acting as network server,
> you mean this code is referenced by something else? And things in
> test do increase image size?
>
This was my question to understand possible options to save space.
>
>>
>>> 2. LTO=y
>>> 3. CONFIG_LOGLEVEL=3 instead of 4.
>>> 4. CONFIG_CMD_DATE is not set
>>> 5. CONFIG_CMD_LICENSE is not set
>>> 6. CONFIG_CMD_PING (if 1-6 did not help).
>>>
>>> And these changes were enough for CI tagrets to build.
>>> I also tested that Raspberry PI 4B works fine (dhcp, ping).
>>> Looking for other boards to test.
>>>
>>> For example for this tbs2910 board changes are:
>> Disabling CMD_DATE is unfortunate. This can help to debug RTC
>> problems (already used it for this purpose).
>> And, if we are that close to the size limit, than maybe we
>> can get away for this series, but for sure will run into
>> trouble for every other small change to u-boot core/driver code.
>>
>> Regards,
>> Soeren
>>
>>
>> The problem is that for many targets the limit is 1MB.
> For tbs2910 it is 383kBytes. And there was plenty of free space
> when I introduced mainline u-boot support. But yes, space got
> tighter over time.
>
>
> Hm,
> orig:
> -rw-r--r-- 1 uboot uboot 371K Dec 5 19:54 u-boot.bin
> lwip:
> -rw-r--r-- 1 uboot uboot 380K Dec 5 19:55 u-boot.bin
>
> Then if I just enable CMD_DATE:
> u-boot.imx exceeds file size limit:
> limit: 0x5fc00 bytes
> actual: 0x60c00 bytes
> excess: 0x1000 bytes
> make: *** [Makefile:1240: u-boot.imx] Error 1
> make: *** Deleting file 'u-boot.imx'
> uboot at 3eebd85985c8:~/uboot-size$ ls -lh u-boot.bin
> -rw-r--r-- 1 uboot uboot 382K Dec 5 19:58 u-boot.bin
>
> So limit for your board is:
> (gdb) p 0x5fc00/1024
> $1 = 383
>
> 383k. Where do you see the space?
Here I do not understand what you want to ask.
As I wrote earlier, yes, tbs2910 limit is 383k, for u-boot.imx, the
number you tried to change in this patch to 408k, but this change is not
possible.
Without your changes there is some space left (not as much as 2014 when
I introduced tbs2910 support in u-boot), but enough to make further
u-boot development with unavoidable small image size increases possible.
(size of v2024.01-rc4 u-boot.imx for tbs2910 is 375k).
Regards,
Soeren
>
> BR,
> Maxim.
>
>> U-Boot in some minimal configuration is about 500kb. But U-boot
>> with EFI, USB, Eth drivers, MMC, RTC, and all the commands is
>> 900+ kb and very close to 1MB. Most of the new features are
>> enabled by default.
> No. Tom does a very good job to ensure that there is no (not much)
> additional space required for unrelated boards that do not need
> new features.
>> I.e. they do not exist in _defconfig and appear in the resulting
>> .config automatically. I would say that for some small targets
>> things like EFI, Secure boot, TPM, Updates and many others are
>> not needed. But if new features will appear by default very soon
>> we will see limits.
> New features will not be enabled for old space constrained boards.
> In your series you did not offer to keep the old implementation
> instead, this is different and the reason why we discuss image
> size constraints.
>
> Regards,
> Soeren
>>
>> BR,
>> Maxim.
>>
>>>
>>> --- a/configs/tbs2910_defconfig
>>> +++ b/configs/tbs2910_defconfig
>>> @@ -18,6 +18,7 @@ CONFIG_SYS_MEMTEST_END=0x2f400000
>>> CONFIG_LTO=y
>>> CONFIG_HAS_BOARD_SIZE_LIMIT=y
>>> CONFIG_BOARD_SIZE_LIMIT=392192
>>> +CONFIG_TIMESTAMP=y (this was added by savedefconfig)
>>> # CONFIG_BOOTSTD is not set
>>> CONFIG_SUPPORT_RAW_INITRD=y
>>> CONFIG_BOOTDELAY=3
>>> @@ -26,6 +27,7 @@ CONFIG_BOOTCOMMAND="mmc rescan; if run
>>> bootcmd_up1; then run bootcmd_up2; else r
>>> CONFIG_USE_PREBOOT=y
>>> CONFIG_PREBOOT="echo PCI:; pci enum; pci 1; usb start"
>>> CONFIG_DEFAULT_FDT_FILE="imx6q-tbs2910.dtb"
>>> +CONFIG_LOGLEVEL=3
>>> CONFIG_PRE_CONSOLE_BUFFER=y
>>> CONFIG_HUSH_PARSER=y
>>> CONFIG_SYS_PROMPT="Matrix U-Boot> "
>>> @@ -52,7 +54,7 @@ CONFIG_CMD_DHCP=y
>>> CONFIG_CMD_MII=y
>>> CONFIG_CMD_PING=y
>>> CONFIG_CMD_CACHE=y
>>> -CONFIG_CMD_TIME=y
>>> +# CONFIG_CMD_DATE is not set
>>> CONFIG_CMD_SYSBOOT=y
>>> # CONFIG_CMD_VIDCONSOLE is not set
>>> CONFIG_CMD_EXT2=y
>>>
>>> BR,
>>> Maxim.
>>>
>>>
>>> On Tue, 28 Nov 2023 at 13:09, Maxim Uvarov
>>> <maxim.uvarov at linaro.org> wrote:
>>>
>>>
>>>
>>> On Tue, 28 Nov 2023 at 03:20, Soeren Moch <smoch at web.de>
>>> wrote:
>>>
>>> On 27.11.23 14:11, Tom Rini wrote:
>>> > On Mon, Nov 27, 2023 at 06:57:09PM +0600, Maxim
>>> Uvarov wrote:
>>> >
>>> >> Increase allowed binary size to fit lwip code.
>>> >>
>>> >> Signed-off-by: Maxim Uvarov <maxim.uvarov at linaro.org>
>>> >> ---
>>> >> configs/tbs2910_defconfig | 2 +-
>>> >> 1 file changed, 1 insertion(+), 1 deletion(-)
>>> >>
>>> >> diff --git a/configs/tbs2910_defconfig
>>> b/configs/tbs2910_defconfig
>>> >> index 8fbe84f1d2..ce40efa9ab 100644
>>> >> --- a/configs/tbs2910_defconfig
>>> >> +++ b/configs/tbs2910_defconfig
>>> >> @@ -17,7 +17,7 @@ CONFIG_SYS_MEMTEST_START=0x10000000
>>> >> CONFIG_SYS_MEMTEST_END=0x2f400000
>>> >> CONFIG_LTO=y
>>> >> CONFIG_HAS_BOARD_SIZE_LIMIT=y
>>> >> -CONFIG_BOARD_SIZE_LIMIT=392192
>>> >> +CONFIG_BOARD_SIZE_LIMIT=417792
>>> >> # CONFIG_BOOTSTD is not set
>>> >> CONFIG_SUPPORT_RAW_INITRD=y
>>> >> CONFIG_BOOTDELAY=3
>>> > This is another case where the binary size is a
>>> fairly hard limit. You
>>> > forgot to cc the board maintainer here (and I
>>> assume the rest of the
>>> > series too) for these config changes.
>>> ThanksTom for sending a notification to me.
>>>
>>> Yes, the CONFIG_BOARD_SIZE_LIMIT is a hard limit and
>>> this patch in its
>>> current form will break tbs2910 support and even
>>> brick the board for
>>> some configurations. So NAK for this patch.
>>> > I think on this platform it's not
>>> > impossible (like it is on am335x where I just
>>> replied) but really
>>> > difficult. I'll let Soeren comment on if switching
>>> the network stack to
>>> > lwip is the kind of feature enhancement that
>>> warrants the pain of
>>> > dealing with the size change here or not.
>>> Network boot is no important feature for this board
>>> and not used in
>>> the default boot configuration. But network support
>>> always was part
>>> of the config, may be used by some users, and is at
>>> least required
>>> to communicate the ethernet address to linux.
>>>
>>> So I'm not interested in a new network stack for
>>> this board, but
>>> also cannot disable network support completely. This
>>> seems to be a
>>> problem for this patch series, since networking
>>> support implies LWIP
>>> now.
>>>
>>>
>>> Thanks Soeren for the explanation. Then yes, something
>>> more advanced is needed
>>> to be done here.
>>>
>>> The question for me is, why is the new network stack
>>> consuming so
>>> much space, with only a few enabled commands? Is the
>>> whole library
>>> linked in with some unused features (the cover
>>> letter mentions much
>>> more than what seems to be used in the converted
>>> commands). Or is
>>> the old network stack linked in in parallel to the
>>> new one? Can
>>> we save space here?
>>>
>>>
>>> Yes, the old code is still there. I decided to not touch
>>> it for the first integration (arp.o, bootp.o, ping.o and
>>> mostly all from net/Makefile). Those files also have
>>> reference code in net/net.c. Not compiling
>>> and not linking this code will save some space, but It's
>>> larger than the current version.
>>> Like for EVM SPL code with usb+net+ext4 and etc have
>>> very minimal space for network stack.
>>> I will take a look at this more closely...
>>>
>>>
>>> NFS support in the old networking code is quite big,
>>> enabled by default,
>>> and probably still there in parallel to this new
>>> lwip library. If there
>>> is really no other option to save space, and lwip in
>>> general is agreed
>>> to be the way forward for U-Boot, and only tbs2910
>>> is blocking that,
>>> then from my point of view disabling NFS for tbs2910
>>> could be a way
>>> to stay within the size limit.
>>>
>>> ok. I think that by default we need something very
>>> minimal (dhcp, tftp), probably ping is even not needed.
>>>
>>> Regards,
>>> Soeren
>>>
>>
>
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