Hi,
(for those who don't know how to stop at breakpoints after relocation..) I came back to this problem today and found https://shenki.github.io/debugging-u-boot-after-relocation/.
So by doing in gdb,
b relocation_done (after you stop at relocation_done), print /x ((gd_t *)$r9)->relocaddr $1 = 0x67f6b000 Add-symbo-file u-boot $1 (type y) c (continue)
Now you can stop at board_init_r or do_mmc_read! Hope that helps. Thanks
Chan Kim
-----Original Message----- From: U-Boot u-boot-bounces@lists.denx.de On Behalf Of Chan Kim Sent: Friday, October 22, 2021 5:19 PM To: U-Boot Mailing List u-boot@lists.denx.de Subject: breakpoint not working in do_mmc_read (using qemu)
Hello, u-boot experts,
I need to modify a proprietary SD card host controller driver to be used in u-boot and I wanted to see the driver interface with the u-boot using qemu.
Trying to run u-boot on qemu with SD card, I found this nice question : https://stackoverflow.com/questions/46239926/booting-kernel-from-sd-in- qemu-arm-with-u-boot
So I followed it and saw ‘mmc rescan’, ‘mmc read’ command works.
Using debugger (arm-none-eabi-gdb), I can follow the code from _start and can set breakpoint at board_init_f and etc.
But even if I set breakpoint at do_mmc_read or do_mmc_rescan, the breakpoint for those functions are not working.
Could anyone tell me what I’m doing wrong? (Are there things I should set in the config?)
The qemu command is this :
qemu-system-arm -machine vexpress-a9 -cpu cortex-a9 -m 128M -dtb ~/prj/abdsn/ab21sim/ab21tsim/LinuxDevDrv/linux- 5.4.21/arch/arm/boot/dts/vexpress-v2p-ca9.dtb -kernel u-boot -sd sd.img - nographic -s -S
and the u-boot (ELF file) contains debug_info.
Any help will be deeply appreciated.
Thanks,
Chan Kim
p.s. BTW, this email list contains mostly PATCH emails between u-boot developers, so I feel a little sorry to ask questions here. 😊