From mboxrd@z Thu Jan 1 00:00:00 1970 From: Khiem Nguyen Date: Wed, 14 Oct 2015 14:11:24 +0000 Subject: Re: [PATCH] ARM: shmobile: defconfig: enable HDMI output for RCar Message-Id: <561E628C.1090803@rvc.renesas.com> List-Id: References: <1407974835-11064-1-git-send-email-khilman@linaro.org> In-Reply-To: <1407974835-11064-1-git-send-email-khilman@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sh@vger.kernel.org On 10/14/2015 8:32 PM, Geert Uytterhoeven wrote: > On Wed, Oct 14, 2015 at 3:18 PM, Khiem Nguyen > wrote: >>>> AFAIK, in some recent versions of Gen2 BSP, all the devices (including >>>> all devices enabled by u-boot for its processing, like Ethernet, TMU, >>>> serial) will be turned off right before jumping to kernel start address. >>> >>> Would it make sense to keep the serial port enabled in order to support >>> early >>> printk ? >>> >> >> I don't think early printk is supported in Gen2 BSP, which is base on LTSI >> 3.10. >> Geert has introduced early printk support for Gen2 in Nov 2014. >> >> Maybe, we need to consider this point for Gen3. > > INTC-RT, MFIS, INTC-SYS, IRQC, and SCIF0 are left enabled, according > to the U-Boot sources. Yes, you are right. Above devices were left enabled. Especially, some interrupt controller devices need to keep ON to ensure system operation while transferring to kernel boot. > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like that. > -- Linus Torvalds >