AM335x 启动不了卡在KARNEL。。

我做了DRR的EMIF测试结果如下，不知道DDR是不是正常的。请各位大侠指导。

Switched to DAP_DebugSS
Read value of 2b94402e from Device_ID register.
CONTROL: device_id = 0x2b94402e* AM335x family* Silicon Revision 2.1

CONTROL: control_status = 0x00400324* SYSBOOT[15:14] = 01b (24 MHz)
CM_CLKSEL_DPLL_DDR = 0x00019017* DPLL_MULT = 400 (x400)* DPLL_DIV = 23 (/24)
CM_DIV_M2_DPLL_DDR = 0x00000201* CLKST = 1: M2 output clock enabled* DIVHS = 1 (/1)

DPLL_DDR Summary
 -> F_input = 24 MHz
 -> CLKOUT_M2 = DDR_PLL_CLKOUT = 400 MHz

EMIF: SDRAM_CONFIG = 0x61a45232* Bits 31:29 (reg_sdram_type) set for DDR3* Bits 28:27 (reg_ibank_pos) set to 0* Bits 26:24 (reg_ddr_term) set for RZQ/4 (001b)* Bits 22:21 (reg_dyn_odt) DDR3 dynamic ODT set to RZQ / 4* Bit  20(reg_ddr_disable_dll) set to 0, DDR3 DLL enabled* Bits 19:18 (reg_sdram_drive) set for RZQ/7 (01b)* Bits 17:16 (reg_cwl) set for 0, CWL = 5* Bits 15:14 (reg_narrow_mode) set to 1 -> 16-bit EMIF interface* Bits 13:10 (reg_cl) set to 4 -> CL = 6* Bits 09:07 (reg_rowsize) set to 4 -> 13 row bits* Bits 06:04 (reg_ibank) set to 3 -> 8 banks* Bits 02:00 (reg_pagesize) set to 2 -> 10 column bits

EMIF: PWR_MGMT_CTRL = 0x00000000
 * Bits 10:8 reg_lp_mode set to 0, auto power management disabled
 * Warning: Bits 7:4 (reg_sr_tim) are in violation of Maximum Self-Refresh Command Limit-> Please see the silicon errata (DDR3: JEDEC Compliance for Maximum Self-Refresh Command Limit) for more details.-> This is only an issue if used in conjunction with reg_lp_mode=2.

DDR PHY: DDR_PHY_CTRL_1 = 0x00100007* Bits 9:8 (reg_phy_rd_local_odt) to 0 -> no termination-> Read termination is highly recommended in general for best DDR3 signal integrity* Bits 4:0 (reg_read_latency) set to 7-> If PHY_INVERT_CLKOUT=0, this is an appropriate value.-> If PHY_INVERT_CLKOUT=1, this is too small.-> PHY_INVERT_CLKOUT is a write-only register, so this needs to be-> inspected closely in the code and RatioSeed spreadsheet.

*********************
*** Register Dump ***
*********************

*(0x4c000000) = 0x40443403
*(0x4c000004) = 0x40000004
*(0x4c000008) = 0x61a45232
*(0x4c00000c) = 0x00000000
*(0x4c000010) = 0x00000c30
*(0x4c000014) = 0x00000c30
*(0x4c000018) = 0x0888c39b
*(0x4c00001c) = 0x0888c39b
*(0x4c000020) = 0x28247fda
*(0x4c000024) = 0x28247fda
*(0x4c000028) = 0x501f821f
*(0x4c00002c) = 0x501f821f
*(0x4c000038) = 0x00000000
*(0x4c00003c) = 0x00000000
*(0x4c000054) = 0x00ffff10
*(0x4c000058) = 0x8000140a
*(0x4c00005c) = 0x00021616
*(0x4c000080) = 0x03ee56a4
*(0x4c000084) = 0x0053ce48
*(0x4c000088) = 0x00010000
*(0x4c00008c) = 0x00000000
*(0x4c000090) = 0xcf5156e8
*(0x4c000098) = 0x00050000
*(0x4c00009c) = 0x00050000
*(0x4c0000a4) = 0x00000000
*(0x4c0000ac) = 0x00000000
*(0x4c0000b4) = 0x00000000
*(0x4c0000bc) = 0x00000000
*(0x4c0000c8) = 0x50074be4
*(0x4c0000d4) = 0x00000000
*(0x4c0000d8) = 0x00000000
*(0x4c0000dc) = 0x00000000
*(0x4c0000e4) = 0x00100007
*(0x4c0000e8) = 0x00100007
*(0x4c000100) = 0x00000000
*(0x4c000104) = 0x00000000
*(0x4c000108) = 0x00000000
*(0x4c000120) = 0x00000305

************************
*** IOCTRL Registers ***
************************

CONTROL: DDR_CMD0_IOCTRL = 0x000003bd* ddr_ba2 Pullup/Pulldown disabled* ddr_wen Pullup/Pulldown disabled* ddr_ba0 Pullup/Pulldown disabled* ddr_a5 Pullup/Pulldown disabled* ddr_ck Pullup/Pulldown disabled* ddr_ckn Pullup/Pulldown disabled* ddr_a3 Pullup/Pulldown disabled* ddr_a4 Pullup/Pulldown disabled* ddr_a8 Pullup/Pulldown disabled* ddr_a9 Pullup/Pulldown disabled* ddr_a6 Pullup/Pulldown disabled* Bits 9:5 control ddr_ck and ddr_ckn- Slew slowest- Drive Strength 10 mA* Bits 4:0 control ddr_ba0, ddr_ba2, ddr_wen, ddr_a[9:8], ddr_a[6:3]- Slew slowest- Drive Strength 10 mA
CONTROL: DDR_CMD1_IOCTRL = 0x000003bd* ddr_a15 Pullup/Pulldown disabled* ddr_a2 Pullup/Pulldown disabled* ddr_a12 Pullup/Pulldown disabled* ddr_a7 Pullup/Pulldown disabled* ddr_ba1 Pullup/Pulldown disabled* ddr_a10 Pullup/Pulldown disabled* ddr_a0 Pullup/Pulldown disabled* ddr_a11 Pullup/Pulldown disabled* ddr_casn Pullup/Pulldown disabled* ddr_rasn Pullup/Pulldown disabled* Bits 4:0 control ddr_15, ddr_a[12:10], ddr_a7, ddr_a2, ddr_a0, ddr_ba1, ddr_casn, ddr_rasn- Slew slowest- Drive Strength 10 mA
CONTROL: DDR_CMD2_IOCTRL = 0x000003bd* ddr_cke Pullup/Pulldown disabled* ddr_resetn Pullup/Pulldown disabled* ddr_odt Pullup/Pulldown disabled* ddr_a14 Pullup/Pulldown disabled* ddr_a13 Pullup/Pulldown disabled* ddr_csn0 Pullup/Pulldown disabled* ddr_a1 Pullup/Pulldown disabled* Bits 4:0 control ddr_cke, ddr_resetn, ddr_odt, ddr_csn0, ddr_[a14:13], ddr_a1- Slew slowest- Drive Strength 10 mA
CONTROL: DDR_DATA0_IOCTRL = 0x000003bd* ddr_d8 Pullup/Pulldown disabled* ddr_d9 Pullup/Pulldown disabled* ddr_d10 Pullup/Pulldown disabled* ddr_d11 Pullup/Pulldown disabled* ddr_d12 Pullup/Pulldown disabled* ddr_d13 Pullup/Pulldown disabled* ddr_d14 Pullup/Pulldown disabled* ddr_d15 Pullup/Pulldown disabled* ddr_dqm1 Pullup/Pulldown disabled* ddr_dqs1 and ddr_dqsn1 Pullup/Pulldown disabled* Bits 9:5 control ddr_dqs1, ddr_dqsn1- Slew slowest- Drive Strength 10 mA* Bits 4:0 control ddr_d[15:8], ddr_dqm1- Slew slowest- Drive Strength 10 mA
CONTROL: DDR_DATA1_IOCTRL = 0x000003bd* ddr_d0 Pullup/Pulldown disabled* ddr_d1 Pullup/Pulldown disabled* ddr_d2 Pullup/Pulldown disabled* ddr_d3 Pullup/Pulldown disabled* ddr_d4 Pullup/Pulldown disabled* ddr_d5 Pullup/Pulldown disabled* ddr_d6 Pullup/Pulldown disabled* ddr_d7 Pullup/Pulldown disabled* ddr_dqm0 Pullup/Pulldown disabled* ddr_dqs0 and ddr_dqsn0 Pullup/Pulldown disabled* Bits 9:5 control ddr_dqs0, ddr_dqsn0- Slew slowest- Drive Strength 10 mA* Bits 4:0 control ddr_d[7:0], dqm0- Slew slowest- Drive Strength 10 mA
CONTROL: DDR_IO_CTRL = 0x00000000* Bit 31: DDR_RESETn controlled by EMIF.* Bit 28 (mddr_sel) configured for SSTL, i.e. DDR2/DDR3/DDR3L operation.
CONTROL: VTP_CTRL = 0x00010167* VTP not disabled (expected in normal operation, but not DS0).
CONTROL: VREF_CTRL = 0x00000000* VREF supplied externally (typical).
CONTROL: DDR_CKE_CTRL = 0x00000001* CKE controlled by EMIF (normal/ungated operation).

karmliu：

另外这个DDR EMIF测试在插了SD卡的情况下测试有没有影响测试结果？

Nancy Wang：

DDR可以正常进行读写吗？或者用GEL文件里面DDR test脚本测试一下也可以。
processors.wiki.ti.com/…/AM335x_DDR_PHY_register_configuration_for_DDR3_using_Software_Leveling

karmliu：

回复 Nancy Wang:

非常感谢您的及时回复，

因为我不是做软件的，我想问什么样的情况是正常的。如图：

karmliu：

回复 karmliu:

这个是运行的图一直停留在KERNEL这里，不停的复位启动10次不等可能有一次可以进入。请问我要做哪些测试才能验证硬件。

karmliu：

回复 karmliu:

我不知道这种现象是不是和DDR有关系。用MTEST 是没有问题 ， GEL可以看到个寄存器正常。
如果我多复位10或20次以上有机会进去一次运行KERNEL。

Nancy Wang：

回复 karmliu:

正常情况下kernel能够正常启动。

您是自己的板子还是购买的开发板？

karmliu：

回复 Nancy Wang:

自己的板子

karmliu：

回复 Nancy Wang:

我需要做那些去验证在哪有影响到这个现象。谢谢

karmliu：

回复 Nancy Wang:

Nancy Wang:谢谢您的解答，自己做的板子，我现在需要做哪些工作去验证会影响到这个现象原因。

Nancy Wang：

回复 karmliu:

看一下这个帖子，有可能DTB中硬件上的一些配置与您自制的开发板不匹配，建议您可以从这个方向上排查一下。 e2e.ti.com/…/2231166 这个帖子也是类似的情况。 e2e.ti.com/…/609626