From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Goldschmidt Date: Fri, 12 Jul 2019 12:30:32 +0200 Subject: [U-Boot] [PATCH 2/2] arm: socfpga: gen5: don't zero bss in board_init_f() In-Reply-To: References: <20190711191813.19550-1-simon.k.r.goldschmidt@gmail.com> <20190711191813.19550-3-simon.k.r.goldschmidt@gmail.com> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Fri, Jul 12, 2019 at 12:29 PM Marek Vasut wrote: > > On 7/12/19 7:29 AM, Simon Goldschmidt wrote: > > On Fri, Jul 12, 2019 at 7:15 AM Marek Vasut wrote: > >> > >> On 7/11/19 9:18 PM, Simon Goldschmidt wrote: > >>> The socfpga gen5 SPL manually zeroed bss in board_init_f(). Now that the > >>> DDR driver does not use bss any more, bss is not used before board_init_r() > >>> and we can remove this hack. > >>> > >>> Signed-off-by: Simon Goldschmidt > >>> --- > >>> > >>> arch/arm/mach-socfpga/spl_gen5.c | 2 -- > >>> 1 file changed, 2 deletions(-) > >>> > >>> diff --git a/arch/arm/mach-socfpga/spl_gen5.c b/arch/arm/mach-socfpga/spl_gen5.c > >>> index 87b76b47de..47e63709ad 100644 > >>> --- a/arch/arm/mach-socfpga/spl_gen5.c > >>> +++ b/arch/arm/mach-socfpga/spl_gen5.c > >>> @@ -79,8 +79,6 @@ void board_init_f(ulong dummy) > >>> writel(SYSMGR_ECC_OCRAM_DERR | SYSMGR_ECC_OCRAM_EN, > >>> &sysmgr_regs->eccgrp_ocram); > >>> > >>> - memset(__bss_start, 0, __bss_end - __bss_start); > >>> - > >>> socfpga_sdram_remap_zero(); > >>> socfpga_pl310_clear(); > >> > >> So who will zero out the BSS ? > > > > BSS is zeroed by crt0.S, but after board_init_f(), before board_init_r(). > > Socfpga just had this double-zeroing because it invalidly used BSS in > > board_init_f(). > > Can you add that to the commit message and resend just this patch ? I > applied the other one. Sure. > > > Some weeks ago on this list, we've had a discussion whether it would be good to > > generally allow such early usage of BSS, possibly via a config option (socfpga > > is not the only platform affected). The outcome was negative and so I've started > > this patch.