Compile Error: not fit in region`irom0_0_seg'

[ESP_Faye]

If it shows compile error like below when we compile our source code by setting as 512KB flash with FOTA(firmware upgrade through WIFI).

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xtensa-lx106-elf-gcc  -L../lib -nostdlib -T../ld/eagle.app.v6.new.512.app1.ld -Wl,--no-check-sections -u call_user_start -Wl,-static -Wl,--start-group -lc -lgcc -lhal -lphy -lpp -lnet80211 -llwip -lwpa -lmain -ljson -lssl -lupgrade -lsmartconfig user/.output/eagle/debug/lib/libuser.a driver/.output/eagle/debug/lib/libdriver.a -Wl,--end-group -o .output/eagle/debug/image/eagle.app.v6.out
/opt/xtensa-lx106-elf/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld: .output/eagle/debug/image/eagle.app.v6.out section `.irom0.text' will not fit in region `irom0_0_seg'
collect2: error: ld returned 1 exit status
make: *** [.output/eagle/debug/image/eagle.app.v6.out] Error 1

It means your source code is too large to fit in.

We can try follow steps on SDK_v0.9.5 (or later) to solve it:
1. compile with default configuration to generate eagle.flash.bin and eagle.irom0text.bin
(1) size of eagle.flash.bin + size of eagle.irom0text.bin >= 236KBytes:
Sorry, your source code is too large, you need to change to a new flash which size is larger than 512KB.
(2) size of eagle.flash.bin + size of eagle.irom0text.bin < 236KBytes:
OK, try step 2.

2. revise file "eagle.app.v6.new.512.app1.ld" which is in \esp_iot_sdk\ld.

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irom0_0_seg :                         org = 0x40201010, len = 0x2B000

change the value of "len" according to the size of your "eagle.irom0text.bin".
Example: if size of “eagle.irom0text.bin” is 179KB, change the configuration to

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irom0_0_seg :                         org = 0x40201010, len = 0x2D000

3. compile user1.bin by selecting boot_v1.2+

PS.
In your source code,
methods without "ICACHE_FLASH_ATTR" in iram1_0_seg which can be 32KB at most,
methods with "ICACHE_FLASH_ATTR" in irom0_0_seg.

Due to ram is limited，so we have these two parts:
methods in iram1_0_seg will be loaded to ram and run when power on;
methods in irom0_0_seg will be loaded to cache and run only if it is called;


如果在编译 512KB flash 支持云端升级版本的软件时，遇到如下错误：

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xtensa-lx106-elf-gcc  -L../lib -nostdlib -T../ld/eagle.app.v6.new.512.app1.ld -Wl,--no-check-sections -u call_user_start -Wl,-static -Wl,--start-group -lc -lgcc -lhal -lphy -lpp -lnet80211 -llwip -lwpa -lmain -ljson -lssl -lupgrade -lsmartconfig user/.output/eagle/debug/lib/libuser.a driver/.output/eagle/debug/lib/libdriver.a -Wl,--end-group -o .output/eagle/debug/image/eagle.app.v6.out
/opt/xtensa-lx106-elf/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld: .output/eagle/debug/image/eagle.app.v6.out section `.irom0.text' will not fit in region `irom0_0_seg'
collect2: error: ld returned 1 exit status
make: *** [.output/eagle/debug/image/eagle.app.v6.out] Error 1

它表示代码量太大，irom 区域存放不下了。

我们可以在 SDK_v0.9.5（及之后）的软件版本中，尝试如下步骤，解决这个问题:
1. 使用默认设置，编译生成 eagle.flash.bin 和 eagle.irom0text.bin
(1) 如果 size of eagle.flash.bin + size of eagle.irom0text.bin >= 236KBytes:
-> 很抱歉，您的代码量太大了，只能换大些的 flash，或者放弃云端升级功能了。
(2) 如果 size of eagle.flash.bin + size of eagle.irom0text.bin < 236KBytes :
-> 请继续步骤 2

2. 在路径 \esp_iot_sdk\ld 下修改文件 “eagle.app.v6.new.512.app1.ld”

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irom0_0_seg :                         org = 0x40201010, len = 0x2B000

根据步骤1中编译的 “eagle.irom0text.bin” size 大小，改写上述 len 的值
示例：如果 “eagle.irom0text.bin” 大小为 179KB，则可修改配置如下

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irom0_0_seg :                         org = 0x40201010, len = 0x2D000

3. 重新编译 user1.bin 选择 boot_v1.2+

补充说明：
代码中，
函数前未加 ICACHE_FLASH_ATTR 的，编译到 iram 中，最大 32KB；
函数前加了 ICACHE_FLASH_ATTR 的，编译到 irom 中；

因为 ram 的空间有限，因此做了这两个部分的区分：
iram 中的代码，会在上电初始就完整加载到 ram 中；
irom 中的代码是用到的时候才从flash 加载到 cache 中执行；

希望本文对您有所帮助！

Thanks for your interest in ESP8266 !