Can't start kernel when the uImage file is big then 6.7M

[liqi-c]

I use MPC8313 board , but when i insert some file to initramfs ,then compiling, the  uImage file is bigger then 6.7M ,and then i can't start kernel success ,the print is belowd :

U-Boot 1.1.6 (Apr 20 2018 - 11:36:58) MPC83XX

Saisi SyncMaster 2000 (SM2000) MC

Clock configuration:

  Coherent System Bus:  166 MHz

  Core:                 333 MHz

  Local Bus Controller: 166 MHz

  Local Bus:             41 MHz

  DDR:                  333 MHz

  SEC:                   55 MHz

  I2C1:                 166 MHz

  I2C2:                 166 MHz

  TSEC1:                166 MHz

  TSEC2:                166 MHz

  USB MPH:                0 MHz

  USB DR:                55 MHz

CPU: MPC8313E, Rev: 21 at 333.333 MHz

INFO: Initializing IOMEM for regset 0

I2C:   ready

DRAM:  256 MB

NAND:  256 MB

Using default environment                  board_init_r  --》env_relocate

In:    serial

Out:   serial

Err:   serial

Net:   P: enter

NATSEMI: INFO: dp83815#0 using MAC: 00:04:9F:EF:23:34

NATSEMI: INFO: dp83815#0 changed to autoneg. enabled, advertise 100 full duplex.   打印来自：natsemi_initialize（netsemi.c）

Not find PCI device

TSEC1, TSEC2, dp83815#0 [PRIME]

Boot in 5 seconds

partition changed to nand0,3

INFO: next.scr loading

Scanning JFFS2 FS: . done.

INFO: next.scr load complete: 11 bytes loaded to 0x100000

INFO: last.scr loading

INFO: last.scr load complete: 22 bytes loaded to 0x100000

partition changed to nand0,4

INFO: fpga loading

Scanning JFFS2 FS: . done.

INFO: fpga load complete: 341436 bytes loaded to 0x100000

INFO: fpga load transferred 341436 bytes

INFO: Programmed binary fpga

INFO: loaded parallel fpga (bin)

### dtb load complete: 8192 bytes loaded to 0xfe00000

BOOT FROM UIMAGE

INFO: part: NAND 256MiB 3,3V 8-bit  off: 00000000  addr: 0f000000

INFO: Loading uImage from NAND 256MiB 3,3V 8-bit, offset 0x1300000  addr: f000000

## Booting image at 0f000000 ...

   Image Name:   

   Image Type:   PowerPC Linux Kernel Image (gzip compressed)

   Data Size:    6527303 Bytes =  6.2 MB

   Load Address: 00000000

   Entry Point:  00000000

   Verifying Checksum ... OK

   Uncompressing Kernel Image ... OK

=> set upper limit to 0x0FE00000

   Booting using flat device tree at 0xfe00000

---------------------------------------------------------------------------------------------------------end .

Then it will start again  ,repert and repeat 

[liqi-c · Accepted solution]

I solved this problem  . 

because the kernel decompress function . we limit the decompress size then we decompress uimage  .  like this :

  unc_len = CFG_BOOTM_LEN

  gunzip ((void *)ntohl(hdr->ih_load), unc_len,  (uchar *)data, &len) 

if  the uimage is bigger then the unc_len ,then we decompress uimage is not complete ,and the kernel is not complete . so when we jump to run kernel ,cpu doesn't know how to run ,so it's will reboot by itself  .

[liqi-c]

And I see some discription in head.S ,like this :

-----------------------

If configured to pin some TLBs, we pin the first 8 Mbytes of kernel,

* 24 Mbytes of data, and the 8M IMMR space.  Anything not covered by

* these mappings is mapped by page tables.

------------------------

 So  , mabey the limit 8M is set by assembly code ? ,how can i fix it ? 

[yipingwang]

Hello li nes,

Please refer to the following definition in ./include/configs/MPC8313ERDB.h, this is Initial Memory map for Linux, please modify it according to your requirement.

#define CFG_BOOTMAPSZ   (8 << 20)

CFG_BOOTMAPSZ is used in the function do_bootm_linux in file ./common/cmd_bootm.c.

In addition, in LTIB released Linux BSP, we provide customers uImage + ramdisk rootfs filesystem, we recommend users use this method to boot up Linux system and add your own files in the rootfs filesystem.

Have a great day,
TIC

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[liqi-c]

Think's very much .

but i set #define CFG_BOOTMAPSZ (254<<20) ,is max then my uimage file .

and the print like this : " => set upper limit to 0x0FE00000 " 254M is bigger then 6.7M

and uboot is boot finished ,no any abnormal message .

just when jump to boot kernel ,and no any message print out ,and then reset auto .

and I find the reset code is : EXCEPTION(0x100, Reset, unknown_exception, EXC_XFER_STD)

but I don't know how to fix it .