Repository : ssh://git@open-mesh.org/doc

On branches: backup-redmine/2019-11-07,master

commit 97b3f5369b8e904a2dbd362ca79195cbad5efcfb Author: Sven Eckelmann sven@narfation.org Date: Mon Oct 14 10:31:23 2019 +0000

doc: open-mesh/Kernel_debugging_with_kgdb

97b3f5369b8e904a2dbd362ca79195cbad5efcfb open-mesh/Kernel_debugging_with_kgdb.textile | 102 +++++++++++++++++++++++++++ 1 file changed, 102 insertions(+)

diff --git a/open-mesh/Kernel_debugging_with_kgdb.textile b/open-mesh/Kernel_debugging_with_kgdb.textile index c689d9a..3ecbb45 100644 --- a/open-mesh/Kernel_debugging_with_kgdb.textile +++ b/open-mesh/Kernel_debugging_with_kgdb.textile @@ -107,6 +107,108 @@ index 84a3d88a7f..c8a017f970 100644 USE_ATKBD = generic 64 </pre>

+For ar71xx (GL.inet AR750 in my case), it would look like: + +<pre> +diff --git a/target/linux/ar71xx/config-4.14 b/target/linux/ar71xx/config-4.14 +index 4bc84792b6..8bd7c8b299 100644 +--- a/target/linux/ar71xx/config-4.14 ++++ b/target/linux/ar71xx/config-4.14 +@@ -290,7 +290,7 @@ CONFIG_ATH79=y + # CONFIG_ATH79_NVRAM is not set + # CONFIG_ATH79_PCI_ATH9K_FIXUP is not set + # CONFIG_ATH79_ROUTERBOOT is not set +-CONFIG_ATH79_WDT=y ++# CONFIG_ATH79_WDT is not set + CONFIG_CEVT_R4K=y + CONFIG_CLKDEV_LOOKUP=y + CONFIG_CLONE_BACKWARDS=y +@@ -299,6 +299,8 @@ CONFIG_CMDLINE_BOOL=y + # CONFIG_CMDLINE_OVERRIDE is not set + CONFIG_COMMON_CLK=y + # CONFIG_COMMON_CLK_BOSTON is not set ++CONFIG_CONSOLE_POLL=y ++CONFIG_CONSOLE_TRANSLATIONS=y + CONFIG_CPU_BIG_ENDIAN=y + CONFIG_CPU_GENERIC_DUMP_TLB=y + CONFIG_CPU_HAS_PREFETCH=y +@@ -316,10 +318,15 @@ CONFIG_CPU_SUPPORTS_MSA=y + CONFIG_CRYPTO_RNG2=y + CONFIG_CRYPTO_WORKQUEUE=y + CONFIG_CSRC_R4K=y ++CONFIG_DEBUG_INFO=y ++CONFIG_DEBUG_INFO_DWARF4=y ++# CONFIG_DEBUG_INFO_REDUCED is not set + CONFIG_DMA_NONCOHERENT=y ++CONFIG_DUMMY_CONSOLE=y + CONFIG_EARLY_PRINTK=y + CONFIG_ETHERNET_PACKET_MANGLE=y + CONFIG_FIXED_PHY=y ++CONFIG_GDB_SCRIPTS=y + CONFIG_GENERIC_ATOMIC64=y + CONFIG_GENERIC_CLOCKEVENTS=y + CONFIG_GENERIC_CMOS_UPDATE=y +@@ -385,6 +392,7 @@ CONFIG_HAVE_PERF_EVENTS=y + CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y + CONFIG_HAVE_SYSCALL_TRACEPOINTS=y + CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y ++CONFIG_HW_CONSOLE=y + CONFIG_HZ_PERIODIC=y + CONFIG_I2C=y + CONFIG_I2C_ALGOBIT=y +@@ -395,13 +403,20 @@ CONFIG_INITRAMFS_COMPRESSION="" + CONFIG_INITRAMFS_ROOT_GID=0 + CONFIG_INITRAMFS_ROOT_UID=0 + CONFIG_INITRAMFS_SOURCE="../../root" ++CONFIG_INPUT=y + CONFIG_INTEL_XWAY_PHY=y + CONFIG_IP17XX_PHY=y + CONFIG_IRQ_DOMAIN=y + CONFIG_IRQ_FORCED_THREADING=y + CONFIG_IRQ_MIPS_CPU=y + CONFIG_IRQ_WORK=y ++CONFIG_KGDB=y ++# CONFIG_KGDB_KDB is not set ++# CONFIG_KGDB_LOW_LEVEL_TRAP is not set ++CONFIG_KGDB_SERIAL_CONSOLE=y ++# CONFIG_KGDB_TESTS is not set + CONFIG_LEDS_GPIO=y ++CONFIG_MAGIC_SYSRQ=y + CONFIG_MARVELL_PHY=y + CONFIG_MDIO_BITBANG=y + CONFIG_MDIO_BUS=y +@@ -472,6 +487,7 @@ CONFIG_RTL8367_PHY=y + # CONFIG_SERIAL_8250_FSL is not set + CONFIG_SERIAL_8250_NR_UARTS=1 + CONFIG_SERIAL_8250_RUNTIME_UARTS=1 ++# CONFIG_SERIAL_KGDB_NMI is not set + # CONFIG_SOC_AR71XX is not set + # CONFIG_SOC_AR724X is not set + # CONFIG_SOC_AR913X is not set +@@ -503,3 +519,8 @@ CONFIG_SYS_SUPPORTS_ZBOOT_UART_PROM=y + CONFIG_TICK_CPU_ACCOUNTING=y + CONFIG_TINY_SRCU=y + CONFIG_USB_SUPPORT=y ++# CONFIG_VGACON_SOFT_SCROLLBACK is not set ++CONFIG_VGA_CONSOLE=y ++CONFIG_VT=y ++CONFIG_VT_CONSOLE=y ++# CONFIG_VT_HW_CONSOLE_BINDING is not set +diff --git a/target/linux/ar71xx/image/Makefile b/target/linux/ar71xx/image/Makefile +index 804532b55c..c485389f56 100644 +--- a/target/linux/ar71xx/image/Makefile ++++ b/target/linux/ar71xx/image/Makefile +@@ -58,7 +58,7 @@ define Device/Default + PROFILES = Default Minimal $$(DEVICE_PROFILE) + MTDPARTS := + BLOCKSIZE := 64k +- CONSOLE := ttyS0,115200 ++ CONSOLE := ttyS0,115200 nokaslr + CMDLINE = $$(if $$(BOARDNAME),board=$$(BOARDNAME)) $$(if $$(MTDPARTS),mtdparts=$$(MTDPARTS)) $$(if $$(CONSOLE),console=$$(CONSOLE)) + KERNEL := kernel-bin | patch-cmdline | lzma | uImage lzma + COMPILE := +</pre> + h3. Enabling python support for gdb

OpenWrt will build a gdb when <code>CONFIG_GDB=y</code> is set in .config. But this version is missing python support. But it can be enabled with following patch: