Hello everybody, I have a customized imx6 solo board. 1 GB of DDR3 ram and MMC for boot.
I have ported u-boot(the fslc community one) and it seems to work fine. I also run stress RAM test and it came out OK. (calibration data is used in imximage.cfg) when I attempt to run kernel it stuck at "*starting kernel*" commands: >>ext4load mmc 0 ${loadaddr} zImage >>ext4load mmc 0 ${fdt_addr} *.dtb >>bootz >>${loadaddr} - ${fdt_addr} (loadaddr=0x12000000 and fdt_addr=0x18000000 the bootargs has the right ttymxc and baudrate value) with early printk it says: "*Uncompressing Linux... done, booting the kernel.*" *printk* doesn't work, (Guess the initialize not done). Fortunately, I have some LEDs on board, so I tried to use them and trace the code. the it seems it kernel hangs at enabling MMU: /arch/arm/kernel/head.S : . . ENTRY(__turn_mmu_on) mov r0, r0 instr_sync mcr p15, 0, r0, c1, c0, 0 mrc p15, 0, r3, c0, c0, 0 instr_sync mov r3, r3 mov r3, r13 ret r3 __turn_on_mmu_end ENDPROC(__turn_mmu_on)`enter code here` ... those mcr and mrc are the point that i can toggle GPIObefore them and not after! I should add: to toggling GPIO I used physical address before them and virtual address after.(I also test with physical add) physical address: for example 0x0209c000 -> gpio data register which virtual address is: 0xf429c000 (just in iMX platform) also I disable i/d cache before boot up kernel. didn't know how to disable MMU but according the u-boot it seems to be disabled. please help me find the solution. Thanks
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