嵌入式开发环境
- 主控芯片: Amlogic A113X
- Linux Kernel : 4.9
- eMMc : 金士顿 4GB
- A113X主控芯片
- 金士顿的4GB eMMC
- 海力士256M DDR
- 博通WIFI模组 AP6212
支持eMMC
现有项目存储需要由Nand Flash换成eMMC
eMMC介绍
eMMC (Embedded Multi Media Card) 为MMC协会所订立的，eMMC 相当于 NandFlash 主控IC ，对外的接口协议与SD、TF卡一样，主要是针对手机或平板电脑等产品的内嵌式存储器标准规格。eMMC的一个明显优势是在封装中集成了一个控制器，它提供标准接口并管理闪存，使得手机厂商就能专注于产品开发的其它部分，并缩短向市场推出产品的时间。这些特点对于希望通过缩小光刻尺寸和降低成本的NAND供应商来说，同样的重要。1
原厂补丁介绍
原厂主要提供3个补丁: uboot,kernel,rootfs
- kernel改动如下
- 禁用nand flash
- 使能eMMC
b/arch/arm64/boot/dts/amlogic/xxx.dts
@@ -60,7 60,7 @@
mtd_nand {
compatible = "amlogic, aml_mtd_nand";
dev_name = "mtdnand";
- status = "okay";
status = "disable";
reg = <0x0 0xFFE07800 0x0 0x200>;
interrupts = < 0 34 1 >;
pinctrl-names = "nand_rb_mod","nand_norb_mod", "nand_cs_only";
@@ -465,7 465,7 @@
};
};
sd_emmc_c: emmc@ffe07000 {
- status = "disabled";
status = "okay";
compatible = "amlogic, meson-aml-mmc";
reg = <0x0 0xffe07000 0x0 0x2000>;
interrupts = <0 218 1>;
@@ -629,7 629,7 @@
system:system
{
pname = "system";
- size = <0x0 0x80000000>;
size = <0x0 0x82000000>;
mask = <1>;
};
cache:cache
--
1.9.1- 内存大小配置
memory@00000000 {
device_type = "memory";
linux,usable-memory = <0x0 0x000000 0x0 0x10000000>;
};这个很重要，内存大小不匹配，会造成内核崩溃，由于这点排除了将近3h
- 文件系统主由buildroot配置编译，主要改动如下:
//分区格式又ubifs改为ext2
-BR2_TARGET_ROOTFS_INITRAMFS_LIST="board/amlogic/common/initramfs/initramfs-49/ramfslist-32-ubi-release"
BR2_TARGET_ROOTFS_INITRAMFS_LIST="board/amlogic/common/initramfs/initramfs-49/ramfslist-32-ext2"
-BR2_TARGET_UBOOT_AMLOGIC_BOOTARGS="root=/dev/ubi0_0 rootfstype=ubifs init=/sbin/init"
BR2_TARGET_UBOOT_AMLOGIC_BOOTARGS="root=/dev/system rootfstype=ext4 init=/sbin/init问题点
打完原提供的补丁之后，编译固件烧录，系统进入文件系统提示:
代码语言：javascript复制[ 2.428575@1] meson-mmc: add_emmc_partition
[ 2.432972@1] meson-mmc: [mmcblk0p01] bootloader offset 0x000000000000, size 0x000000400000
[ 2.442260@1] meson-mmc: [mmcblk0p02] reserved offset 0x000002400000, size 0x000004000000
[ 2.451530@1] meson-mmc: [mmcblk0p03] cache offset 0x000006c00000, size 0x000020000000
[ 2.460851@1] meson-mmc: [mmcblk0p04] env offset 0x000027400000, size 0x000000800000
[ 2.470182@1] meson-mmc: [mmcblk0p05] logo offset 0x000028400000, size 0x000002000000
[ 2.479483@1] meson-mmc: [mmcblk0p06] recovery offset 0x00002ac00000, size 0x000002000000
[ 2.488812@1] meson-mmc: [mmcblk0p07] rsv offset 0x00002d400000, size 0x000000800000
[ 2.498127@1] meson-mmc: [mmcblk0p08] tee offset 0x00002e400000, size 0x000000800000
[ 2.507435@1] meson-mmc: [mmcblk0p09] crypt offset 0x00002f400000, size 0x000002000000
[ 2.516736@1] meson-mmc: [mmcblk0p10] misc offset 0x000031c00000, size 0x000002000000
[ 2.526073@1] meson-mmc: [mmcblk0p11] instaboot offset 0x000034400000, size 0x000000400000
[ 2.535382@1] meson-mmc: [mmcblk0p12] boot offset 0x000035000000, size 0x000002000000
[ 2.544688@1] meson-mmc: [mmcblk0p13] system offset 0x000037800000, size 0x000082000000
[ 2.554014@1] meson-mmc: [mmcblk0p14] data offset 0x0000ba000000, size 0x000028000000
[ 2.563147@1] card key: card_blk_probe.
[ 2.566920@1] emmc_key_init:183 emmc key lba_start:0x12020,lba_end:0x12220
[ 2.573731@1] emmc key: emmc_key_init:205 ok.
[ 2.578066@1] meson-mmc: amlmmc_dtb_init: register dtb chardev[ 2.583862@1] meson-mmc: amlmmc_dtb_init: register dtb chardev OK
[ 2.589749@1] meson-mmc: Exit aml_emmc_partition_ops OK.
[ 2.815558@3] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
[ 2.815608@3] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1
[ 2.823704@3] xhci-hcd xhci-hcd.0.auto: hcc params 0x0220f664 hci version 0x100 quirks 0x02010010
[ 2.832219@3] xhci-hcd xhci-hcd.0.auto: irq 26, io mem 0xff500000
[ 2.839052@3] hub 1-0:1.0: USB hub found
[ 2.842123@3] hub 1-0:1.0: 1 port detected
[ 2.846403@3] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
[ 2.851750@3] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2
[ 2.859554@3] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[ 2.868496@3] hub 2-0:1.0: USB hub found
[ 2.871617@3] hub 2-0:1.0: config failed, hub doesn't have any ports! (err -19)
[ 2.879625@3] platform ff642000.audiobus:loopback: Can't retrieve tdmin_mpll clock
[ 2.886341@3] if use extern loopback, pls set datalb-lane-mask-in
[ 2.892359@3] parse loopback:, lb mode:0
[ 2.896319@3] datain_src:4, datain_chnum:8, datain_chumask:3f
[ 2.902100@3] datalb_src:2, datalb_chnum:2
[ 2.906237@3] datalb_chswap:0x0,datalb_chumask:3
[ 2.913126@3] aml_pdm_probe
[ 2.913674@3] aml_pdm_dai_probe
[ 2.916781@3] aml_dai_set_tdm_sysclk freq(12288000), mpll/mclk(2)
[ 2.922942@3] aml_dai_set_tdm_slot(), txmask(0x3), rxmask(0x3)
[ 2.928578@3] slots(2), slot_width(32), lanes(1)
[ 2.933258@3] asoc aml_dai_set_tdm_fmt, 0x4014, ffffffc00cccd118, id(0), clksel(0)
[ 2.940750@3] pad clk ctl value:0
[ 2.944015@3] sclk_ph0 (pad) clk ctl set:0
[ 2.948070@3] master_mode(1), binv(0), finv(0) out_skew(1), in_skew(3)
[ 2.954893@3] asoc-aml-card auge_sound: multicodec <-> TDM-A mapping ok
[ 2.961104@3] aml_dai_set_tdm_sysclk freq(12288000), mpll/mclk(2)
[ 2.967244@3] aml_dai_set_tdm_slot(), txmask(0x3), rxmask(0x3)
[ 2.972909@3] slots(2), slot_width(32), lanes(1)
[ 2.977572@3] asoc aml_dai_set_tdm_fmt, 0x4001, ffffffc00cccd318, id(1), clksel(1)
[ 2.985072@3] pad clk ctl value:3
[ 2.988347@3] sclk_ph0 (pad) clk ctl set:3
[ 2.992403@3] master_mode(1), binv(0), finv(0) out_skew(1), in_skew(3)
[ 2.999089@3] asoc-aml-card auge_sound: multicodec <-> TDM-B mapping ok
[ 3.005429@3] aml_dai_set_tdm_sysclk freq(12288000), mpll/mclk(2)
[ 3.011574@3] aml_dai_set_tdm_slot(), txmask(0x3), rxmask(0x3)
[ 3.017242@3] slots(2), slot_width(32), lanes(2)
[ 3.021910@3] tas575x_set_dai_fmt, format:0x4011
[ 3.026471@3] asoc aml_dai_set_tdm_fmt, 0x4011, ffffffc00cccd618, id(2), clksel(2)
[ 3.033976@3] pad clk ctl value:3
[ 3.037250@3] sclk_ph0 (pad) clk ctl set:3
[ 3.041306@3] master_mode(1), binv(0), finv(0) out_skew(1), in_skew(3)
[ 3.047929@3] asoc-aml-card auge_sound: tas575x <-> TDM-C mapping ok
[ 3.054282@3] aml_pdm_pcm_new dai->name: ff642000.audiobus:pdm dai->id: 0
[ 3.060839@3] asoc-aml-card auge_sound: dummy <-> ff642000.audiobus:pdm mapping ok
[ 3.070351@3] snd_card_add_kcontrols card:ffffffc00d1b9818
[ 3.075047@0] aml_vrtc rtc: setting system clock to 2015-01-01 00:00:05 UTC (1420070405)
[ 3.082182@0] dwc_otg: usb0: type: 2 speed: 0, config: 0, dma: 0, id: 0, phy: ffe09000, ctrl: 0
[ 3.190782@0] dwc_otg: Core Release: 3.10a
[ 3.190812@0] dwc_otg: Setting default values for core params
[ 3.194974@0] dwc_otg: curmode: 0, host_only: 0
[ 3.211743@0] dwc_otg: Using Buffer DMA mode
[ 3.211763@0] dwc_otg: OTG VER PARAM: 1, OTG VER FLAG: 1
[ 3.215642@0] dwc_otg: Working on port type = SLAVE
[ 3.220475@0] dwc_otg: Dedicated Tx FIFOs mode
[ 3.226670@0] cpucore_cooling_register, max_cpu_core_num:4
[ 3.238246@0] gxbb_pm: enter meson_pm_probe!
[ 3.238363@0] gxbb_pm: meson_pm_probe done
[ 3.24126 3.247556@0] meson_uart ff803000.serial: ttyS0 use xtal(8M) 24000000 change 115200 to 115200
[ 3.252569@0] Freeing unused kernel memory: 4480K
[ 3.255336@0] Failed to execute /init (error -2) //-2 返回值代表文件夹不存在
[ 3.265107@0] meson_uart ff803000.serial: ttyS0 use xtal(8M) 24000000 change 115200 to 115200
mkdir: can't create directory '/dev/pts': File exists
can't run '/etc/init.d/rcS': No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory- 看到
Failed to execute /init (error -2)参考2，可以确定返回值的含义3
// buildroot 默认配置文件中configs/xxx_defconfig 屏蔽该选项问题解决
# System configuration
#
# BR2_SYSTEM_BIN_SH_BASH=y
# BR2_SYSTEM_BIN_SH="bash"- NorFlash、NandFlash、eMMC比较区别 ↩︎
- Linux init failures now easier to debug ↩︎
- Failed to execute /init ↩︎
