On Wed, 14 Apr 2021 13:20:44 +0200 Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> wrote: > On 14.04.21 13:07, Antony Pavlov wrote: > > On Wed, 14 Apr 2021 11:54:27 +0200 > > Sascha Hauer <sha@xxxxxxxxxxxxxx> wrote: > > > >> On Wed, Apr 14, 2021 at 08:54:22AM +0300, Antony Pavlov wrote: > >>> Hi Ahmad! > >>> > >>> Here is the iomem command output on erizo: > >>> > >>> barebox:/ iomem > >>> 0x00000000 - 0xffffffff (size 0x00000000) iomem > >>> 0x80000000 - 0x807fffff (size 0x00800000) ram0 > >>> 0x804ffd00 - 0x805ffcff (size 0x00100000) malloc space > >>> 0x805ffd00 - 0x805fffe6 (size 0x000002e7) board data > >>> 0x80600000 - 0x80636b1f (size 0x00036b20) barebox > >>> 0x80636b20 - 0x8063ec9b (size 0x0000817c) barebox data > >>> 0x8063ec9c - 0x80643147 (size 0x000044ac) bss > >>> 0x807e0000 - 0x807fffff (size 0x00020000) stack > >>> 0x90000000 - 0x9000001f (size 0x00000020) 90000000.uart@xxxxxxxxxxx > >>> 0x91000000 - 0x91000003 (size 0x00000004) 91000000.gpio@xxxxxxxxxxx > >>> 0x91000004 - 0x91000007 (size 0x00000004) 91000000.gpio@xxxxxxxxxxx > >>> > >>> I see large unused region between bss and stack regions (>1600 Kbytes). > >> > >> That's normal. The compressed barebox knows the size of the uncompressed > >> barebox, but it doesn't know the size of the bss segment above it. For > >> that reason we have a very pessimistic estimate of: > >> > >> #define MAX_BSS_SIZE SZ_1M > >> > >> The barebox binary itself is then aligned to the previous 1MiB > >> boundary, so barebox usually starts at 2MiB below the end of SDRAM. > >> That's a bit wasteful for boards with very little memory like the erizo, > >> but that's how things are at the moment. > > > > Can we make it configurable via Kconfig? > > Or even better: Could we easily add to the piggy data the size of bss > it contains? > On MIPS we already have: bss_len = (unsigned long)&__bss_stop - (unsigned long)__bss_start; On RISC-V we have __bss_stop and __bss_start, but we don't use them as MIPS does. P.S. hmmm... why there is '&' prior to __bss_stop on MIPS and there is no '&' prior to __bss_start? > -- > Pengutronix e.K. | | > Steuerwalder Str. 21 | http://www.pengutronix.de/ | > 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- Best regards, Antony Pavlov _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
